Statistics for Maths Words beginning with C

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Hint	Answer	% Correct
perimeter of circle	circumference	87%
electronic maths tool	calculator	85%
its area is pi r squared	circle	79%
surface area is 6l^2	cube	74%
1/sec	cosine	71%
middle	center	68%
differentiation is a big part of this	calculus	67%
pi r squared h is the formula for volume	cylinder	60%
(3,1)	coordinate	58%
1/tan	cotangent	54%
1/sin	cosecant	50%
+ c	constant	47%
bulging outwatrds	convex	45%
english word for rectangular prism	cuboid	45%
3d shape	cone	43%
a + bi	complex number	39%
for 729 it is 9	cube root	38%
descriptive of an arc	curve	35%
3 for 3x	coefficient	34%
part of circle	chord	31%
not prime	composite number	25%
a + b + c = c + a + b	commutative rule	24%
9 C 5	combination	20%
adds to 90	complementary angle	19%
z*	conjugate	19%
axes	cartesian plane	16%
lie on same line	collinear	16%
a good line of best fit?	correlation	15%
angle in the same corner	corresponding angle	10%
inverse and flip	contrapositive	3%