40) A cone is surmounted on a hemisphere. The slant height of the cone is 7cm and its radius is 5cm, then total surface area of the solid is. A) 400cm’ B) 440cm C) 380cm’D) 350cm
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Answer:
Radius r=7cm
Height h=24cm
To find slant height l
l
2
2
=r
2
+h
2
l
2
=7
2
+24
2
l
2
=625
l=25cm
Curved surface area of cone is πrl
=
7
22
×7×25
=22×25
=550cm
2
Curved surface area of cone is 550cm
2
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