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Equilateral triangle sides and angles congruent

Showing that all of the angles of an equilateral triangle are 60 degrees

Khan Academy
Congruence and isosceles and equilateral triangles
488
06:28

Equilateral and isosceles example problems

Three example problems involving isosceles and equilateral triangles. 2 from Art of Problem Solving (by Richard Ruscyk) book

Khan Academy
Congruence and isosceles and equilateral triangles
515
06:26