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r = 10 cm
P balok = 2. r = 2. 10 = 20 cm
t balok = . r = . 10 = 5
Luas balok =
L balok = 2 (p.l) + (p.t) + (l.t)}
= 2(20.10) +(20.5) + (10.10)}
= 2. ( 200 + 100 + 100)
= 2. 400
= 800 Cm^2