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180 = (10 x d2) : 2
180 x 2 = 10 x d2
360 = 10 x d2
d2 = 360 : 10
d2 = 36
180 = 1/2 x 10 x D2
180 = 5 x D2
D2 = 180 : 5
= 36 cm
Jadi, panjang D2 adalah 36 cm