Math Test Chapter 3

equilateral triangle

all sides and angles are the same

isosceles triangles

at least 2 congruent sides or angles

scalene triangles

have no congruent sides or angles

find the sum of the angle measures formula

(n-2)x180

find the number of triangles in a polygon formula

(n-2)

find each angle of a regular polygon formula

(n-2)x180 divided by n

if the angle sum is given and want to find the number of sides formula

n=sum/180+2

If two angles of one triangle are congruent to two angles of another triangle then…

the triangles are SIMILAR

line

extends forever in both directions

plane

a 2d shape that extends forever in all directions

line segment

a line where both sides end with a dot

ray

A dot on one side of the line and an arrow on the other

obtuse

greater than 90

acute

less than 90

right

equal to 90

complementary angles

add up to 90

supplementary angles

add up to 180