chapter 1 math review

Segment bisector

cuts a segment directly in half

angle bisector

a segment / ray that divides an angle into two congruent angle

vertical angles

2 non-adjacent angles formed by two intercepting lines ; always congruent

supplementary

two or more angles whose measures have a sum of 180 degrees

complementary

two or more angles whose measures have a sum of 90 degrees

adjacent angles

two angles that lie in the same plane, have a common side, and a common vertex, but no common interior points

collinear

points on the same line ; if three points are collinear, you can conclude that one point is between the other two

coplaner

points on the same plane

point

zero dimensions, named with a capital letter, location in space

line

one dimension, named with two capital letters or 1 lowercase, through any two points, there is exactly one line

plane

two dimensions, named with any three points not on the same line or one capital letter that isn’t a point

perpendicular

intersect to form right angles ; symbol is an upside down T

congruent

if two line segments have the same length, they are congruent ; symbol is and = sign w/ ~ on top

linear pair

a pair of adjacent angles whose non-common sides are opposite rays

midpoint formula

x1+x2/2 ; y1+y2/2

Pythagorean Theorm

a² + b² = c²

distance formula

d = sqrt (x2-x1)² + (y2 - y1)²