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Definition Term
% Correct
For a triangle, it's one-half base times height; for a square it is a side squared Area

94.8% A line segment that goes from one point on a circle to another, through its center Diameter

89.1% Term for any angle between 90 and 180 degrees Obtuse

82.4% The longest side, which is opposite the 90° angle, in a right triangle Hypotenuse

80.6% Line or segment which splits another segment or angle into two equal parts Bisector

77.2% A quadrilateral with four equal sides and perpendicular diagonals Rhombus

76.6% A triangle that has (at least) two equal or congruent sides Isosceles

74.9% The distance around a plane figure or the sum of all of the sides of a polygon Perimeter

72.2% The corner point of a polygon or where the two segments of an angle meet Vertex

70.6% A figure with nine sides and nine internal angles Nonagon

65.3%

Definition Term
% Correct
One of 4 regions on the Cartesian plane as determined by the axes Quadrant

65.2% A pair of angles that together add up to 90 degrees Complementary

58.7% A quadrilateral in which a pair of opposite sides are parallel to each other Trapezoid

55.9% A pair of angles that together add up to 180 degrees Supplementary

48.4% A quadrilateral with two sets of congruent, adjacent sides Kite

41.8% An angle of a polygon created by extending one of the sides Exterior angle

38.3% Line segment connecting a vertex of a triangle with the midpoint of the opposite side Median

28.9% A self-similar figure, such as the Mandelbrot set Fractal

28.3% A set of all points that have the same positional constraint Locus

19.9% An arc or full circle on a sphere that shares its center with a sphere Great Circle

15.6%

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