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4s = 60
s = 60/4
s = 15 cm
√ 15² - 12²
√ 225 - 144
√ 81
9 cm
Panjang diagonal yang lain = 9 x 2 = 18 cm
B) Luas = 1/2 d1 x d2
= 1/2 x 18 x 24
= 216 cm²