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a = 12 cm, b = 9 cm, c = 15 cm
maka
L = 252 cm²
⇒ 2 · La + K · t = 252
⇒ 2 · 1/2 · a · b + (a + b + c)(t) = 252
⇒ 12 · 9 + (12 + 9 + 15)(t) = 252
⇒ 108 + 36t = 252
⇒ 36t = 252 - 108
⇒ 36t = 144
⇒ t = 144/36
⇒ t = 4 cm
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