![]() A triangle with base b b b and equal side ℓ \ell ℓ has area b 4 ℓ 2 − b 2 4 \frac ∠ D C B = 1 8 0 ∘ − 8 0 ∘ − 8 0 ∘ = 2 0 ∘ by the angle sum of a triangle.A triangle is isosceles if two of its sides are of the same length. Likewise, given two equal angles and the length of any side, the structure of the triangle can be determined.ĭetermining the area can be done with only a few pieces of information (namely, 3): Isosceles Triangle Definition, Formulae, Properties, Solved Examples
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