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135 = 1/2 x 18 x d2
135 = 9 x d2
d2 = 15 cm
jadi diagonal 2 sebesar 15 cm
d1= 18 cm
L = 1/2×d1×d2
135 = 1/2×18×d2
135 = 9×d2
d2 = 135/9
d2 = 15 cm
jadi panjang diagonal yang kedua 15 cm