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maka
K = 70 m
⇒ 2(p + l) = 70
⇒ p + l = 35
⇒ l + 5 + l = 35
⇒ 2l = 30
⇒ l = 30/2
⇒ l = 15 m
Dan
p = l + 5
= 15 + 5
= 20 m
Sehingga
L = p × l
= 20 × 15
= 300 m²
Jawab : C
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