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Suponiendo que tiene solo dos lados congruentes y que el lado no congruente es la base.
2/5 x + 2/5 x + x = 90
9/5 x = 90
x = 90 ÷ 9/5
x =50 2/5 de 50 son 20
Sus lados miden 20 cm, 20 cm y 50 cm.