Question

You can mark me as brainliest​

Answer 1

Answer:

Right circular cone of height = 8.4 cm . Radius of its base =2.1 cm .

It is melted and recast into sphere. As we know that,

Volume of a cone =1/3 pi r^ 2 h .

Volume of sphere =4/3 Pi r^ 3

Using this formula in the equation, we get.

Volume of ne = Volume of sphere.

→ 1/3 * pi * R ^ 2 * h = 4/3 * pi * r ^ 3 .

Rightarrow Pi R^ 2 h=4 pi r^ 3 .

Rightarrow R^ 2 h=4r^ 3

Rightarrow(2.1)^ 2 *8.4=4* r^ 3 .

Rightarrow4.41*8.4=4* r^ 3

37.044 = 4r ^ 3 Rightarrow3

r ^ 3 = 9.261 .

r ^ 3 = (2.1) ^ 3 .

>r=2.1 cm .