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= 7/12 × 72
= 42 cm
panjang = 5/12 × setengah keliling
= 5/12 × 72
= 30 cm
luas = 42 × 30
= 1260 cm kuadrat
p : l = 7 : 5
misal : p = 7n
l = 5n
Dit: L = ...?
Jawab:
K = 144 m
2.(p + l) = 144 m
7n + 5n =
12n = 72 m
n =
n = 6m
p = 7n
= 7.(6 m)
= 42 m
l = 5n
= 5.(6 m)
= 30 m
L = p x l
= 42 m x 30 m
= 1260 m²
JADI, luas tanah tersebut ialah 1260 m²