A right triangle has one 90° and a variety of often-studied properties including:

The Equilateral triangle shown on the left has three equal sides and three equal angles. Each angle is 60°

The Isosceles triangle shown on the left has two equal sides and two equal angles.

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Definitions

Giving definitions

Term	Definition
Right Triangles	A right triangle has one 90° and a variety of often-studied properties including:
Equilateral triangle	The Equilateral triangle shown on the left has three equal sides and three equal angles. Each angle is 60°
Isosceles triangle	The Isosceles triangle shown on the left has two equal sides and two equal angles.