26 terms

# Geometry Vocabulary

#### Terms in this set (...)

Collinear
Points that lie on the same line
Linear Pair
A pair of adjacent angles whose noncommon sides are opposite rays.
Supplementary angles
Two angles whose sum is 180 degrees
Complementary angles
Two angles whose sum is 90 degrees
Vertical Angles
A pair of opposite congruent angles formed by intersecting lines
If P is in the interior of <RST, then m<RSP + m<PST = m<RST
If B is between A and C, then AB + BC = AC
Congruent
Having the same size and shape
Angle bisector
a ray that divides an angle into two congruent angles
Segment bisector
a segment, ray, line, or plane that intersects a segment at its midpoint
Midpoint
A point that divides a segment into two congruent segments
postulate
something accepted as true without proof; an axiom
theorem
A mathematical statement which we can prove to be true
Line segment
A part of a line with two endpoints
Line
A straight path that has no thickness and extends forever.
Plane
A flat surface that has no thickness and extends forever.
Distance
the length between any two points in the absolute value of the difference of the coordinates
Distance Formula
d = √[( x₂ - x₁)² + (y₂ - y₁)²]
Midpoint Formula
The formula for a halfway point between two coordinates.
Pythagorean Theorem
The sum of the squares of the legs of a right triangle is equal to the square of the hypotenuse.