![]() It can be said that any two sides are always congruent. ![]() In an Isosceles triangle, two sides are equal and the two angles opposite to the sides are also equal. Suppose a triangle with sides a, b, and c is given then its perimeter is given by Perimeter of a triangle is defined as the sum of all three sides of a triangle. Therefore, the triangle has two basic formulas which help us to determine its area and perimeter. In geometry, for every two-dimensional shape (2D shape), there are always two basic measurements that we need to find out, i.e., the area and perimeter of that shape.
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