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t=3V ÷ πr²
t=(3. 4158) ÷ (22/7. 10,5 .10,5)
t=12474 ÷ 346,5
t=36 cm
s²=t²+r²=36²+10,5²=1296+110,25=1406,25
s=√1406,25=37,5 cm
Luas permukaan
=πr(r+s)
=22/7 . 10,5 (10,5+37,5)
=33(48)
=1584 cm²