Question

K=280m2
Panjangnya 1 1/3 dari lebarnya
Berapa luas bangun tersebut...cm2
(Persegi panjang)

Answer 1

K = 2×(p+ℓ)
280 = 2×( 1 1/3x + x )
280÷2 = 1 1/3x + x
140 = 2 1/3 x
140 = 7/3 x
x = 140 × 3/7
x = 60

maka
p = 4/3 × 60 = 80 m = 8000 cm
ℓ = 60 m = 6000 cm

luas
= p × ℓ
= 8.000 × 6.000
= 48.000.000 cm²