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t = 12 cm
s = akar 144 + 25 = 13 cm
314 = 3,14. 25 . t/3
314= 78,5 . t / 3
t = 314 : 78,5. 3
t= 12
S= Akar r^2 + t^2
S= Akar 5^2 + 12^2
s= Akar 25+ 144
s= Akar 169
s = 13 cm.