Question

how many lead balls each of radius 1.5 CM can be made by melting a bigger ball of radius 9 CM ​

Answer 1

Answer:

Step-by-step explanation:

Volume of a sphere is

4/3πr2 that is 4/3πr(square)

So the volume of the big sphere will be

4/3π×9×9= 339.12

Now the volume of the small sphere will be

4/3π1.5×1 .5 = 9.42

Now the number of small sphere will be

Volume of big sphere÷volume of small sphere

339.12÷9.42 = 36

So 36 small spheres will be formed

Answer 2

Answer:

36 balls

Step-by-step explanation:

Radius Of Bigger Ball (R) = 9 cm

Radius Of Smaller Ball (r)= 1.5 cm

Area of Bigger Ball = πR²

= π 9²

= 81π

Area Of Smaller Ball = πr²

= π (1.5)²

= 2.25 π

$total \: number \: of \: balls \: = \\ (total \: number \: of \: bigger \: ball) \div \\ (total \: number \: of \: smaller \: ball)$

= 81π /2.25π

Total No. Of Balls = 36