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D1 = 15 cm
L = 225
maka :
L = (D1 x D2) / 2
225 = 15 x D2 /2
225 x 2 = 15D2
450 = 15 D2
d2 = 450/15
= 30 cm
jadi D2 = 15 cm
225 = 1/2 x 15 x d2
d2 = 225 : 1/2 x 15
= 30 cm