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2200 = 2 (P(20) + P(10) + (20)(10))
2200 = 2 (20P + 10P + 200)
2200 = 2 (30P + 200)
2200 = 60P + 400
60P = 2200 - 400
60P = 1800
P = 1800 / 60
P = 30 cm
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Luas permukaan = 2 (PL + PT + LT)
556 = 2 (P(10) + P(8) + (10)(8))
556 = 2 (10P + 8P + 80)
556 = 2 (18P + 80)
556 = 36P + 160
36P = 556 - 160
36P = 396
P = 396 / 36
P = 11 cm