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L = 1/2 × a × t
64 = 1/2 × 2t × t
64 × 2 = 2t × t
128 = 2t²
64 = t²
√64 = √t²
8 = t
a = 2t
= 2(8)
= 16 cm
Jadi panjang sisi alasnya adalah 16 cm.