Geometry Chapter 1

Terms in this set (24)

adjacent angles
Two angles that share a common side and have the same vertex
complentary angles
Two angles whose sum is 90 degrees
suplementary angles
Two angles whose sum is 180 degrees
linear pair
A pair of adjacent angles whose noncommon sides are opposite rays.
plane
a flat surface that has no thickness and extends forever
Line
extends on forever in both directions
ray
a part of a line that starts at an endpoint and extends forever in one direction
line segment or segment
consists of two endpoints and all the points between them
angle
A figure formed by two rays with a common endpoint
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 2 congruent segments
colinear points
points that lie on the same line
coplanar points
points on the same plane
vertical angles
two nonadjacent angles formed by two intersecting lines
hypotenuse
the side of a right triangle opposite the right angle
Pythagorean Theorem
a²+b²=c²
midpoint formula
(x₁+x₂)/2, (y₁+y₂)/2
Distance Formula
see pic
Area of a circle
A=πr²
Area of a triangle
A= 1/2 bh
Area of a rectangle
A=lw
Area of a square
A=s²
Circumference of a circle
C=2πr or C=πd
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