There are 3 types of triangle based on their sides: equilateral, isosceles and scalene.
All 3 sides are exactly the same length. Every interior angle measures 60° and they all add up to 180°.
Exactly 2 sides are the same length. The angles opposite those equal sides are also equal. An equilateral triangle is a special case of an isosceles triangle.
All 3 sides have different lengths. All 3 interior angles are also different.
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