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80 = 2 (p + 8 + 2l)
80 = 2p + 16 + 4l
80 - 16 = 2p + 4l
64 = 2p + 4l
40 = 2p + 2l
64 = 2p + 4l
---------------------- -
-24 = -2l
24 = 2l
l = 12 cm
2p + 2(12) = 40
20 + 24 = 40
2p = 40 - 24
2p = 16
p = 8
L = p × l
= 12 × 8
= 96 cm²