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Transcript
Triangles (part 4) Isosceles Triangles Legs of an isosceles triangle—the two congruent sides of an isosceles triangle that has only two congruent sides Base—the noncongruent side of an isosceles triangle that has only two congruent sides base leg leg Isosceles Triangles Base angles—the two angles adjacent to the base and opposite the legs of an isosceles triangle Vertex angle—the angle formed by the legs and opposite the base of an isosceles triangle. leg vertex angle leg base angles base 1 Triangles (part 4) Base Angles Theorem If two sides of a triangle are congruent, then the angles opposite the sides are congruent. B C A Converse of the Base Angles Theorem If two angles of a triangle are congruent, then the sides opposite the angles are congruent. B A C 2 Triangles (part 4) Corollary to the Base Angles Theorem If a triangle is equilateral, then it is equiangular. Corollary to the Converse of the Base Angles Theorem If a triangle is equiangular, then it is equilateral. equilateral + equiangular = regular Find the values of x and y. 44° 4y° 3
