For a triangle, it's one-half base times height; for a square it is a side squared
A
Line or segment which splits another segment or angle into two equal parts
B
A pair of angles that together add up to 90 degrees
C
A line segment that goes from one point on a circle to another, through its center
D
An angle of a polygon created by extending one of the sides
E
A self-similar figure, such as the Mandelbrot set
F
An arc or full circle on a sphere that shares its center with a sphere
G
The longest side, which is opposite the 90° angle, in a right triangle
H
A triangle that has (at least) two equal or congruent sides
I
A quadrilateral with two sets of congruent, adjacent sides
K
Definition
Term
Letter
A set of all points that have the same positional constraint
L
Line segment connecting a vertex of a triangle with the midpoint of the opposite side
M
A figure with nine sides and nine internal angles
N
Term for any angle between 90 and 180 degrees
O
The distance around a plane figure or the sum of all of the sides of a polygon
P
One of 4 regions on the Cartesian plane as determined by the axes
Q
A quadrilateral with four equal sides and perpendicular diagonals
R
A pair of angles that together add up to 180 degrees
S
A quadrilateral in which a pair of opposite sides are parallel to each other
T
The corner point of a polygon or where the two segments of an angle meet
V
The vertical axis of a two-dimensional Cartesian coordinate system
Alternate name for the two-dimensional Cartesian coordinate system (two words)
What every step of a proper proof requires (usually in the form of a theorem or postulate)
The region between two concentric circles with different radii
Δy/Δx of a horizontal line
A vector whose length is one
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