Question

What is the C of radii 2.1

Answer 1

Answer:

The volume V of sphere of radius r is given by V=34πr3

Here, r=2.1 cm

∴V=34×722×(2.1)3

⇒V=38.808 cm3

Answer 2

Answer:

Solution

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Correct option is

B

2.1 cm

Volume of the cone =  

3

1

​

πr  

c

2

​

h

Volume of the sphere =  

3

4

​

πr  

s

3

​

 

r  

c

​

 is the radius of cone =2.1 cm        ....(Given)

Let r  

s

​

 be the radius of the sphere

h is the height of cone =8.4 cm        ...(Given)

Volume of cone = Volume of sphere          ...(Given)

⇒  

3

1

​

πr  

c

2

​

h=  

3

4

​

πr  

s

3

​

 

⇒  

3

1

​

r  

c

2

​

h=  

3

4

​

r  

s

3

​

 

⇒r  

s

3

​

=9.261

⇒r  

s

​

=2.1 cm

Explanation: