# Math Vocabulary

Based on the definitions, can you guess these words from the world of mathematics?
Quiz by Quizmaster
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Last updated: June 16, 2022
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 First submitted September 11, 2013 Times taken 72,385 Average score 60.0% Rating 4.27
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 Defintion Word Five-sided polygon Pentagon Opposite of concave Convex Concept represented by the ! symbol Factorial Number that has no factorsbesides itself and one Prime number Three-dimensional version of a circle Sphere Quantity that represents both aspeed and a direction Velocity Angle of less than 90 degrees Acute angle Type of average; the mostcommon value in a set Mode The longest side of a right triangle Hypotenuse Triangle in which all sideshave different lengths Scalene
 Defintion Word Two-dimensional version of a line Plane What this symbol represents: ∑ Summation The bottom number in a fraction Denominator Point where lines meetin a polygon Vertex Ratio of a circle's circumferenceto its diameter Pi The set of positive integers Natural numbers Tetrahedrons and Dodecahedronsare types of this Polyhedron 10 to the 100th power Googol Square roots of negative numbers Imaginary numbers Number that cannot be expressedas a fraction of two integers Irrational number
+1
Level 14
Jun 23, 2015
2:31 im 12 beetch
+4
Level 24
Jan 14, 2016
Please accept 'sigma notation' for summation
+3
Level 60
Feb 2, 2016
Tetrahedrons and dodecahedrons are actually "regular polyhedrons," since they both have congruent edges and faces, and only a few other polyhedrons fall into that category. Please accept that answer as well.
+1
Level 78
Jan 3, 2024
Nonsense.
+3
Level 89
Feb 2, 2016
Fun quiz. The bottom number in a fraction can also be called the divisor. Perhaps you should accept this as well?
+2
Level 90
Feb 2, 2016
Please accept counting numbers. Many include 0 in the definition of natural numbers, but counting numbers can only be nonnegative.
+1
Level 61
Nov 3, 2016
Natural numbers never include zero
+1
Level 70
May 17, 2018
https://en.m.wikipedia.org/wiki/Peano_axioms

Read the first axiom in the section on formulation.

+1
Level 75
Jan 19, 2017
0 is included in whole numbers, not natural numbers.
+1
Level 78
Aug 4, 2022
I've heard it both ways. Natural numbers usually include 0 in theoretical computer science especially. In my experience people use the term "positive integers" when they want to exclude 0.
+1
Level 76
Apr 8, 2020
Some mathematicians consider zero a to be a natural number, others don't.
+2
Level 86
Feb 2, 2016
Sorry to repeat myself, but seriously, an imaginary number is a number whose square is a negative number, not the "square root of a negative number". That may seem to be equivalent, but it's not. Of course, you have to know a bit about functions to understand that...
+2
Level 61
Nov 3, 2016
Of course, it actually is equivalent. This is a commonly accepted fact that is taught everywhere. Every number has two roots, and every negative number has roots that are imaginary.
+2
Level 70
Jun 22, 2018
You can define a square root of k as a root of the equation x^2 - k = 0. Then imaginary numbers are square roots of negative numbers. A square root is not always a function.
+4
Level 86
Feb 2, 2016
I also don't like that definition of a prime number, because it doesn't clearly exclude the case of 1 ( 1 is NOT a prime number ). The correct, though less explicit definition, is simply to say that a prime number is a number with exactly two positive divisors...
+1
Level 65
Feb 2, 2016
1/20. Would have scored 6/20 had I been able to answer in Dutch. Mathematics was never one of my fortes...
+1
Level 32
Feb 5, 2016
3.14 should be accepted for "Pi", as well as,"median" for most common value in a set, and maybe "vertix" for vertex and "Hypothenuse"
+4
Level 61
Nov 3, 2016
Now, on the other hand, a much better approximation would be 16*arctan(1/5) - 4*arctan(1/239).
+11
Level 76
Apr 8, 2020
The median is not the most common value in a set. Mode is the only correct answer.
+1
Level 65
Feb 7, 2024
Just refer to it by its name; median is middle, mode is most common; just spell it correctly
+4
Level 44
Feb 5, 2016
Complex Numbers for imaginary numbers
+3
Level 34
Feb 5, 2016
square roots of negative numbers can also complex numbers pls consider that
+2
Level 61
Nov 3, 2016
Every real number is also complex. It's too generic.
+2
Level 55
Aug 3, 2022
not terminologically, there is a distinction
+1
Level 78
Jan 3, 2024
Square a complex number and you get another complex number, not a negative number.
+1
Level 61
Mar 20, 2024
Sorry but you're wrong.

Any number like this i*x (x being real) will lead to :

(i*x)²=-x²

Any complex not real nor imaginary like x+i*y will give :

(x+i*y)²=x²-y²+2i*xy (the only solution to get a negative real number is x=0)

+1
Level 86
Feb 6, 2016
TheButcher, Deekei : No. Just bother to read the above comments about that, please...
+1
Level 56
Feb 8, 2016
This quiz has the least fun comments section I've ever seen on JetPunk.
+1
Level 82
Feb 19, 2016
It's hard to make math fun. Even harder to make maths fun.
+1
Level 66
Jul 13, 2016
It is extremely hard to make math fun, but there are some very interesting parts to it, but those are what mathematicians haven't discovered yet, sadly.

Was this a joke? Math and Maths are the same subject right?

+4
Level 61
Nov 3, 2016
Math is always fun! Yay math! Also physics. Yay physics!
+2
Level 82
May 17, 2018
Maths is like math but more of it.
+2
Level 71
Jul 14, 2019
One math plus one math is two maths :) Now that's Mathematics for you ;)
+1
Level 66
Jul 13, 2016
Not too hard, thanks!
+1
Level 70
Nov 3, 2016
In my life I've only used 8 of these facts for any worthwhile purpose. The rest have been stored away in my brain , since my schooldays, like an old book in a library that nobody reads .
+1
Level 71
Jul 14, 2019
Some of my books have become illegible, or gone missing ( someone return them please?) Many are dusty.. but are legible again after a little dust off
+2
Level 91
Nov 3, 2016
I would like to add to the cause of counting numbers. It's been nearly 30 years but I distinctly remember those terms being synonymous and the world of google tends to agree.
+2
Level 61
Nov 3, 2016
I would consider adding "square" for two-dimensional line. I've spent some time learning about hypercubes, and the example everybody always uses is that a point is 0 dimensions, a line is 1, a square is 2, and a cube is 3. Going off of this example, the logical answer for "two dimensional line" would be a square. I eventually did get plane as the right answer, but I still think square should be added as a type-in.
+4
Level 70
May 17, 2018
Technically you should replace line with "lime segment".
+3
Level 73
Dec 1, 2018
That's what you put on your Corona.
+2
Level 70
May 17, 2019
Good point. Line segment was the intended phrase.
+1
Level 65
Feb 7, 2024
Lines are infinite, planes are infinite, squares are not infinite
+1
Level 32
Nov 24, 2016
I'm 10 so I got 8
+1
Level 75
Dec 21, 2020
I'm 34, so how many did I get?
+2
Level 27
Feb 25, 2022
27.2
+1
Level 75
Feb 25, 2022
I think that entitles me to 6 points for this quiz please QM. Maybe 7 points since I'm 35 now.
+1
Level 42
Jan 11, 2017
2:59 first try. Helps being a maths major lol.
+3
Level 45
Jun 7, 2017
I never learned the sigma as anything but sigma, nevertheless a summation. Perhaps, sigma should work?
+1
Level 65
Feb 7, 2024
As someone who knows Greek but not Math, I see this as an absolute win
+2
Level 60
Sep 18, 2017
can hypothenusa be accepted ?
+1
Level 30
May 2, 2018
To be pedantic, a "Three-dimensional version of a circle" is a 3-sphere (a 3-dimensional hypersphere). A normal sphere has only two dimensions: e.g. latitude and longitude. While spheres are often embedded in 3-dimensional space you can also embed a sphere in 4-dimensional space, so it's not really saying much.
+1
Level 70
May 17, 2018
A circle is defined as the set of all points in a plane that are a fixed distance from its centre. A sphere is the logical continuation replacing a plane with 3-dimensional space. You can embed a sphere in 4-dimensional space but it will no longer be the set of all points a fixed distance from the centre.
+1
Level 61
Sep 14, 2018
The original commenter is technically correct; an ordinary "sphere" is actually a 2-sphere, a 2-dimensional surface embedded in 3-dimensional space. A 3-sphere would actually be embedded in a 4-dimensional space. A more accurate answer would probably be "ball," which refers to not only the sphere but also the space enclosed by the sphere.
+2
Level 70
Sep 15, 2018
That is the case in topology. But the most natural definition for a circle in Euclidean geometry requires two dimensions, and a sphere would be the result in three dimensions. The circle itself, though, is I suppose one-dimensional. A ball would be the three-dimensional equivalent of a disc.
+8
Level 89
May 17, 2018
Typed 1 with 100 zeroes and it didn't work. Disappointed.
+1
Level 36
May 17, 2018
A two-dimensional version of a line is a line. Did you mean 3 dimensional?
+1
Level 70
May 18, 2018
A line is one-dimensional. A two-dimensional shape has the up-down and the left-right dimension, but a line only has one: along the line.
+1
Level 71
Jul 14, 2019
think of length height and width. A line only has length. A sheet got two of those and a wooden beam for instance has all 3.
+1
Level 45
May 17, 2018
Hmm, hard when you're not native English. Got 16/20, but I was typing 'regular solids', 'faculty, facultation'. 'irreal numbers, complex numbers'. Never heard of Scalene.
+1
Level 48
Jun 27, 2018
Got all of them first try, lol, I'm a math nerd.
+1
Level 61
Sep 14, 2018
Strictly speaking, the object commonly referred to as a sphere is only two-dimensional (while a circle has only one dimension). The answer "ball" should also be accepted; the space bounded by a 2-sphere constitutes a three-dimensional ball: https://en.wikipedia.org/wiki/Ball_(mathematics)
+6
Level 95
Nov 25, 2018
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 should be accepted as an answer to 10 to the 100th power
+1
Level 27
Nov 30, 2018
the question "two-dimensional version of a line" is incorrect because a line is already in two space, whereas a plane is only used in 3-space.
+1
Level 70
Feb 15, 2019
2-space is a plane.
+1
Level 71
Jul 14, 2019
A plane is on x and y axis, and zero on z axis. It has no vertical height.
+3
Level 95
Dec 19, 2018
Please consider accepting "cylinder" for "three-dimensional representation of a circle." I understand why sphere is more widely answered, but I would argue that not only is a cylinder a three-dimensional representation of a circle, but that it is also a better answer to the question as it really only is a circle extruded over a third dimension rather than a circle rotated around an axis.
+2
Level 70
Feb 15, 2019
A circle is defined in 2-dimensional space as the set of all points that are a given distance from the circle's centre. If you replace 2-dimensional space by 3-dimensional space you get a sphere.
+1
Level 53
May 16, 2019
Add depth to the circle to get a cylinder. Add depth to a square and you don't always get a cube. It can be a rectanguloid. "3-D circle" is not good enough.
+1
Level 41
May 16, 2019
complex numbers is also an acceptable answer for square root of negative numbers
+1
Level 70
May 17, 2019
Imaginary numbers are a subset of the complex numbers. No complex numbers that are not also imaginary numbers are ever square roots of negative real numbers. So imaginary numbers are the correct answer.
+5
Level 35
May 16, 2019
Would you consider accepting 'counting numbers' along with 'natural numbers'? Thanks for checking.
+1
Level 53
May 16, 2019
This is not a very well informed math quiz. Even after years and years, its still not good.

1) A three dimensional version of a circle doesn't have to be a sphere. It could be a cylinder

2) I would argue that a "two-dimensional line" is a line.

+3
Level 75
Dec 21, 2020
These comment sections would really short if people read previous comments before posting.
+1
Level 61
Aug 3, 2022
Exactly. A line has 1 dimension.
+1
Level 49
Jun 9, 2019
Well, I've not even heard some of these terms before! However, I've done pretty well in life without needing them x
+1
Level 69
Aug 16, 2019
Love this quiz. 👍
+1
Level 29
Nov 4, 2019
I'm thirteen and got them all right first try
+6
Level 65
Feb 1, 2020
I believe 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 should be accepted
+1
Level 75
Apr 7, 2020
I agree
+2
Level 25
Jun 5, 2020
i'm so glad platonic solid is accepted
+1
Level 61
Jan 24, 2021
I wish I was high on potenuse!

-Keegan Michael Key

+1
Level 60
Jan 25, 2021
i thought being in second semester of Accelerated Geometry would get me more than 12/20
+2
Level 55
Feb 2, 2021
Tip: Listen in High School Math class...
+1
Level 79
Mar 8, 2021
I kept trying 'corner' for vertex.
+3
Level 52
Mar 8, 2021
Can you accept counting numbers for natural numbers?
+1
Level 45
Mar 18, 2021
I feel smart. I know I'm not, but I feel smart.
+3
Level 66
Sep 15, 2021
You didn't accept 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

for 10^100 :(

+1
Level 68
Oct 12, 2021
Can you accept dumb spellings of hypotenuse?
+1
Level 80
Oct 12, 2021
Wow that was...humbling. 10/20. it's always been my weakest subject, but yikes. I have apparently forgotten most of the math I learned in high school and college lol.
+1
Level 67
Aug 3, 2022
Any chance of accepting "Scaline" for "Scalene" - knew it but can't spell.
+1
Level 33
May 29, 2024
Well, now you've learned how to spell it!
+3
Level 67
Aug 3, 2022
A bit difficult for not english native speakers.
+1
Level 68
Aug 3, 2022
I got 14 out of 20, so 90%, yay!
+1
Level 55
Aug 3, 2022
it should probably be “line segment” instead of just “line”
+3
Level 45
Aug 3, 2022
Was anyone else just adding 0s to 10 and hoping you’d eventually get it??
+3
Level 73
Aug 3, 2022
I don't know why, but this is henceforth my favourite quiz.

The questions, the comments, that blissful thing about maths, everything is just perfect here!

+1
Level 46
Dec 15, 2022
i spelt scalene wrong, i spelt it as scalence, i also did it in the first draft of this comment... smh...
+1
Level 43
Jun 11, 2023
I said fictional instead of imaginary🤦
+1
Level 60
Feb 16, 2024
can you change the polyhedron question to a definition as in the description at the top of the quiz? the question at the moment just gives two examples and ask for a category they belong to.
+1
Level 44
May 1, 2024
lol vector is accepted