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Geo NOTES Date: _____ Lesson 4-5: Isosceles and Equilateral Triangles Isosceles Triangle: at least two congruent sides (legs), and two congruent angles (base angles) Isosceles Triangle Theorem: If two sides of a triangle are congruent, then the angles opposite those sides are also congruent. Converse of Isosceles Triangle Theorem: If two angles of a triangle are congruent, then the sides opposite the angles are congruent. Theorem: The bisector of the vertex angle of an isosceles triangle is also the perpendicular bisector of the base. If a triangle is equilateral, it is equiangular. (and vice-versa) 1. The perimeter is 54 feet. Find the value of “x” & “y”, and the length of each side. 2. Find the value of “t”. HOMEWORK: Practice Worksheet 4.5 3. Find the value of “z”.