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klo sama kaki => alas = tinggi
16 cm2 = 1/2 x a x a (*tinggi diganti a karena sama saja dg alas
16 x 2 = a²
32 = a²
√32 = a = t = 4 √2 cm
sisi mirinng = √(√32)² + (√32)² = √ 32+32 = √64 = 8 cm