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K = 40 cm
p = 4+l
mka :
K = 2 x (p+l)
40 = 2 x (4+l+l)
40 = 2 x (4+2l)
40 = 8+4l
l = 40-8/4
l = 8 cm
jdi pnjang = 4+8 = 12 cm
L = p x l
= 12 x 8
= 96 cm²
40 = 2(x + 4) + 2(x)
40 = 2x + 8 + 2x
40 = 4x + 8
4x = 40 - 8
4x = 32
x = 32/4 = 8
Panjang = x + 4 = 8 + 4 = 12 cm
Lebar = x = 8 cm
L. persegi = p x l
L. persegi = 12 x 8 = 96 cm²
Jawab: B