Jawabanmu

2014-03-18T20:43:43+07:00
Lp tabung = 2. \pi .r (r+t)
= 2. 3,14 . 10 (10 + 25)
= 62,8 ( 35 )
=2198 cm2
2014-03-18T20:46:22+07:00
L.p. Tabung = 2πr ( t+r )
d = 20 cm
r = 10 cm
t = 25 cm

L.p. Taabung = 2πr ( t+r )
                    = 2 x 3,14 x 10 ( 25 + 10 )
                    = 62,8 x 35
                    = 2198 cm²

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