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K = 40 cm
pnjang = 8 cm
maka :
K = 2 x (p+l)
40 = 2 x (8+l)
40 = 16 + 2l
2l = 40-16
l = 24/2
l = 12 cm
jadi L = p x l
= 8 x 12
= 96 cm²
40 = 2(p+l)
40 = 2(l+8+l)
20 = 2l+8
2l = 20-8
2l = 12
l = 12/2
l = 6
p = l+8 = 6+8 = 14
L = p.l = 14.6 = 84 cm²