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240 = 30 x d2 x 1/2
240 = 15 x d2
240 : 15 = d2
16 = d2
maka diagonal yg lain = d2 = 16 cm
240 = 1/2 x 30 x d₂
240 = 15 x d₂
d₂ = 240 / 15
d₂ = 16 cm