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p = l+5
ditanya : luas?
jawab :
k = 2(p+l)
70 = 2((l+5)+l)
70/2 = (l+5)+l
35 = 5+2l
35-5 = 2l
30 = 2l
30/2 = l
15 = l
p = l+5
p = 15+5
p = 20
L = p × l
L = 20 × 15
L = 300 (C)