Download Name: _______________________ Geometry Chapter 4: TRIANGLES

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Geometry
Chapter 4: TRIANGLES
1.
If two angles of one triangle are congruent to two angles of another triangle, then the third angles
are congruent.
2. Side-Side-Side (SSS) Postulate –
If the three sides of one triangle are congruent to the three sides of another triangle, then the two triangles
are congruent.
3. Side-Angle-Side (SAS) Postulate –
If two sides and the included angle of one triangle are congruent to two sides and the included angle of
another triangle, then the two triangles are congruent.
4. Angle-Side-Angle (ASA) Postulate –
If two angles and the included side of one triangle are congruent to two angles and the included side of
another triangle, then the two triangles are congruent.
5. Angle-Angle-Side (AAS) Theorem –
If two angles and a nonincluded side of one triangle are congruent to two angles and the corresponding
nonincluded side of another triangle, then the triangles are congruent.
6. Hypotenuse-Leg (HL) TheoremIf the hypotenuse and leg of one right triangle are congruent to the hypotenuse and leg of another right
triangle, then the triangles are congruent.
7. CPCTC -
Corresponding Parts of Congruent Triangles are Congruent
8. Isosceles Triangle Theorem –
If two sides of a triangle are congruent, then the angles opposite those sides are congruent.
9. Converse of the Isosceles Triangle Theorem –
10. Theorem about bisectors–
The bisector of the vertex angle of an isosceles triangle is the perpendicular bisector of the base.
11. Corollary to the Isosceles Triangle Theorem –
If a triangle is equilateral, then the triangle is equiangular.
12. Corollary to the Converse of the Isosceles Triangle Theorem –
If a triangle is equiangular, then the triangle is equilateral.