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keliling=2(P+L)
72=2(3x+1x)
72:2=4x
36=4x
9=x
Panjang=3x=3.9=27
Lebar=1x=1.9=9
Rumus
P.L
27.9
243cm2
3 : 1 = 3+1 = 4
panjang = 3/4 × 72 ÷ 2
= 3 × 18 ÷ 2 = 54 ÷ 2 = 27 cm
lebar = 1/4 × 72 ÷ 2
= 1 × 18 ÷ 2 = 18 ÷ 2 = 9 cm
*dibagi 2 karena pada rumus keliling persegi panjang dikali 2,sedangkan ini harus kebalikannya yaitu dibagi 2
Luas = p × l = 27 × 9 × 1 cm²
= 243 cm²