9 terms

# Chapter 4

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Triangle sum theorem
The sum of the measures of the interior angles of a triangle is 180°
Exterior angle theorem
measure of the exterior angle is equal to the sum of the remote interior angles
Third angles theorem
If two angles of one triangle are congruent to two angles of a second triangle, then the third angles are also congruent
SSS Congruence postulate
if 3 sides of 1 triangle are are congruent to 3 sides of another triangle, then the 2 triangles are congruent
SAS Congruence postulate
if 2 sides and the included angle of 1 triangle are congruent to 2 sides and the included angle of another triangle, then the 2 triangles are congruent
ASA Congruence postulate
if 2 angles and the included side of one triangle are congruent to 2 angles and the included side of another triangle, then the 2 triangles are congruent
AAS Congruence theorem
if two angles and a side of one triangle are congruent to the corresponding angles and side of another triangle, then they are congruent
HL Congruence theorem
if in two right triangles, the hypotenuse and leg of one are congruent to the hypotenuse and leg of the other, then the triangles are congruent to each other
isosceles triangle theroem
if 2 sides of a triangle are congruent, then the angles opposite these sides are also congruent