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= 12 * diagonal 2 / 2 = 42 cm^2, 12 dibagi sama 2 hasilnya 6
= 6 * diagonal 2 = 42 cm^2
diagonal 2 = 42 / 6
diagonal 2 = 7 cm
48 = 1/2 x 12 x d2
48 = 6 x d2
8 cm = d2