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1/2 x 20 x 10
= 100 cm kuadrat
10x15 = 150cm kuadrat
= 100 + 150 = 250 cm kuadrat (a)
10.
L = d1 x d2/2
150= 25 x d2/2
150x2= 25 x d2
300= 25 x d2
d2 = 300/25
d2 = 12cm (b)