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280 cm=2 (1 1/3 × lebar)+ 2 × lebar
280 cm= 14/3 × lebar
lebar = 280×3
14
lebar = 60 cm
panjang= (1 1/3 × lebar)
= (4/3 × 60 cm)
= 80 cm
luas = panjang × lebar
= 80 cm × 60 cm
= 4800 cm²
p= 1 1/3 l
Dit: L= .........?
Solusi
K = 2 (p+l)
280 = 2 (1 1/3 l +l)
280 = 2 ( 7/3 l)
280 = 4.666667l
l = 60
subtitusikan
p = 1 1/3 l
= 4/3 * 60
= 80
masukkan pada rumus luas
L = p*l
= 80*60
= 4.800 cm2
Terima Kasih!!!