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Ini kalau kerucut = rs= 3,14x5x13= 204,1 cm2
Ini kalau tabung = r2 + 2 rt = 3,14x5x5 + 2x3,14x5x12
= 78,5 + 376,8 = 455, 3 cm2
= r2 + 2r.t
=3,14.5.5 + 2.3,14.5.12
=78,5 + 376,8
=455,3 cm