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135 = 1/2 x 18 x d2
135 = 9 x d2
135/9 = d2
15 = d2
135 = 18 x d2 /2
135x2 = 18 x d2
270 = 18 x d2
270/18 = d2
15 = d2
jadi panjang diagonal satunya adalah 15 cm