Question

A solid metallic hemisphere of diameter
21 cm is melted and recast into a number
of smaller cones, each of diameter 7 cm
and height 9 cm. Find the number of
cones so formed.​

Answer 1

Answer:

vol. of hemisphere = 2/3 πr 3

2/3π10.5^3=771.75π

vol. of Cone=1/3πr 2h

= 1/3πx3.5^2 x 9 =36.75π

No. of Cones --771.75π/36.75π = 21

21 Nos. Ans