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V = 22/7.10,5².20
= 33.210
= 6930 cm³
Lp = 2.phi.r(r+t)
= 2.22/7.10,5(10,5+20)
= 2.33 (30,5)
= 66.30,5
= 2013 cm²
luas lingkaran(alas) =phi x r x r = 3,14 x 10,5 x 10,5 = 346,185
volume= luas lingkaran(alas ) x tingi = 346,185 x 20 = 6923.7cm3
2.luas permukaan =2phi r2 ( r + t )
-2phi r = 2 x 3,14 x 10,5 = 65,94
- (r + t ) = 10,5 + 20 = 30,5
luas permukaan = 65,94 x 30,5 = 2011,17