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Kll = 280 m
Kll = 2 (p + ℓ)
280 = 2 (p + ℓ)
140 = p + ℓ
140 = 4/3ℓ + ℓ
140 = 7/3ℓ
ℓ = 140 : 7/3
ℓ = 60 cm
p = 4/3ℓ
p = 4/3 (60)
p = 80 cm
Luas = p x ℓ
Luas = 80 x 60
Luas = 4800 cm²
Jadi, luas tanahnya adalah 4800 cm²
Ok?
P : L
4 : 3
Keliling = 2p + 2l
= 2(4) + 2(3)
= 14
280 : 14 = 20.
P = 20.4 = 80
L = 20.3 = 60
Luas = pl
Luas = 80 x 60
Luas = 4800
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