

The equilateral triangle is a triangle with sides that are all the same length. The three interior angles are all the same too. If we use what we learned above, that all the angles must total 180 degrees, then each angle in an equilateral triangle is 180/3 = 60 degrees. 
An isosceles triangle is a triangle with two equal sides. As a result of having two equal sides, two of the angles will be the same too. 
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