7. Volume of a cone is 1212 cm3 and its height is 24cm. Find the surface area of the cone.
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Answer:
Given that:
h=24 cm,
Volume of cone =1212 cm3
πr^2 h/3=1212
r^2=1212×3×7/22
r^2 =1156.90 cm⇒r≈34 cm
Surface area of cone
=πr(r+ ✓r^2+h^2)
=22/7 ×34(34+ ✓1157+576 )
= 22/7 ×34(34+41.62)
=8081.41cm^3
.
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