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5^2 + 12^2 = x^2
25 + 144 = x^2
169 = x^2
13 cm = x
Lperm = 2.La + k.tinggi
= 2. 1/2. a.t + (12+13+5). 16 cm
=12. 5 + 30. 16 cm
= 60 cm + 48 cm2
=108 cm2