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panjang = l + 4
K = 40 cm
maka :
K = 2 x (p+l)
40 = 2 x (l+4+l)
40 = 8 + 4l
l = 40-8/4
l = 8 cm
> pnjang = l + 4 = 8+4 = 12 cm
> Luas = 12 x 8
= 96 cm²
40=2(2L+4)=4L+8
L=8
P=12
luas=8×12=96 cm²