Geometry Legs are congruent Isosceles Triangle Vertex Angle Base Angles Legs Theorem 43 Isosceles Triangle Thm If two sides of a triangle are congruent then the angles opposite those sides are congruent ID: 1019471
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1. Section 4.5 isosceles & equilateral trianglesGeometry
2. Legs are congruentIsosceles TriangleVertex AngleBase AnglesLegs
3. Theorem 4-3 (Isosceles Triangle Thm): If two sides of a triangle are congruent, then the angles opposite those sides are congruent.acb
4.
5. Theorem 4-4 (Converse of Isosceles Triangle Thm): If two angles of a triangle are congruent, then the sides opposite the angles are congruent.
6. The bisector of the vertex angle of an isosceles triangle is the perpendicular bisector of the base.Theorem 4-5ABC
7. Find the values of x and y.Ex. 2)MLN63°y°x°
8. Corollary: a statement that follows immediately from a theoremCorollary to Thm 4-3: If a triangle is equilateral, then it is equiangular.Corollary to Thm 4-4: If a triangle is equiangular, then it is equilateral.
9. Ex. 3)ABCMIf find
10. Ex. 4)ABCMIf find
11. Ex. 5)ABCMIf andfind x.
12. Ex. 6) Find the missing angles and sides.