math 1 (8.1-8.6)

formulas

midpoint formula

distance formula

perimeter

all sides of polygon added together

area of a triangle

area of a rectangle

acute angle

0° < x < 90°

right angle

x = 90°

obtuse angle

90° < x < 180°

straight angle

x = 180°

congruent angles

angles that have the same angle measure
(when naming an angle in a triangle, the order of the letters have to be the same for both)

angle addition postulate

complementary angles

two positive angles whose measures have a sum of 90°

supplementary angles

two positive angles whose measures have a sum of 180°

adjacent angles

two angles that share a common vertex and side

(neighbors)

linear pairs

two adjacent angles

(the angles are supplementary)

(when their noncommon sides are opposite rays)

vertical angles