# Geometry - Congruent Triangles - Chapter 4

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1. The congruent sides of an isosceles triangle are called ______________.
legs
2. The non congruent side of an isosceles triangle is called the _______________.
base
3. The two angles at the base of an isosceles triangle are called the _________________.
sides
4. If two angles at the base of an isosceles triangle  congruent, then _______________________.
the angles opposite them are congruent.
5. If two angles of a triangle are congruent, then ________________________________.
the sides opposite them are congruent.
6. If a triangle is equilateral, then it is __________.
equilangular
7. If a triangle is equiangular, then it is ____________ .
equilateral
8. Theorem 4-1

The Isosceles Triangle Theorem

If two sides of a triangle are congruent, then the angles opposite those sides are congruent.
9. The Isosceles Triangle Theorem (Theorem 4-1) often stated that the base angles of an isosceles triangle are congruent.

*  An equilateral triangle is also equiangular.
*  An equilateral triangle has three 60° angles.
*  The bisector of the vertex angles of an isosceles triangle is perpendicular to the base at its midpoint.
10. Theorem 4-2

If two angles of a triangle are congruent, then the sides opposite those angles are congruent.

Corollary
An equiangular triangle is also equilateral.
11. SSS - side, side, side
12. ASA
13. SAS
14. AAS
15. HL
16. Find interior and exterior angle sum
17. Find each interior and exterior angle in regular polygons
18. Find missing interior and exterior angles in irregular polygons
19. Differentiate between convex and non-convex polygons
20. CPCTC
 Author: Mamadams ID: 290886 Card Set: Geometry - Congruent Triangles - Chapter 4 Updated: 2014-12-07 16:13:20 Tags: Geometry Folders: Description: Geometry Show Answers: