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216 = 18 x d2 / 2
216 x 2 = 18 x d2
432 = 18 x d2
432/18 = d2
24 = d2
jadi panjang diagonal satunya adalah 24 cm
semoga membantu
216 = 18 x d2 x 1/2
216 = 9 x d2
216 : 9 = d2
24 = d2
mka yg lain panjang diagonalnya = 24 cm