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Isosceles Triangles
4­6
Isosceles Triangle Theorem (ITT)
If 2 sides of a triangle are congruent then the angles
opposite those sides are congruent.
Ex.
Statements
Reasons
Ex. 1.
a) Name all isosceles triangles.
b) Name 2 congruent segments (unmarked).
c) Name 2 congruent angles (unmarked).
2.
a) Name all isosceles triangles.
b) Name the legs of triangle ABC.
c) Name the base of triangle BDC
d) Name the vertex angle of triangle ABD
e) Name the base angles of triangle BDC
3.
Properties of Equilateral Triangles
• If a triangle is equilateral, then the measure of each
angle is 60o.
• A triangle is equilateral if and only if it is equiangular.
Ex.
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