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Verified answer
Panjang = pLebar = l
l = p - 4
K = 2(p + l)
40 = 2(p - 4 + p)
40 = 2(2p - 4)
40 = 4p - 8
40 + 8 = 4p
4p = 48
p = 12
Panjang = 12 cm
l = p - 4
l = 12 - 4
l = 8
Lebar = 8 cm
L = pl
L = 12 × 8
L = 96 cm²
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