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d1xd2:2=80
10x16:2=80
D1 = 10 cm
L = 80 cm²
Dit:
Berapa panjang d2?
Jawab:
L = 1/2 x D1 x D2
80 = 1/2 x 10 x D2
80 = 5 x D2
D2 = 80 : 5
= 16 cm
Jadi, panjang D2 adalah 16 cm