Question

Radius and slant height of a cone are 20cm and 29cm

Answer 1

Answer:

GIVEN : radius of cone “r” = 20cm

Slant height of cone “l” = 29cm

we take π =  

TO FIND : volume of the cylinder “V” = ?

PROCEDURE :

As we know that, volume of cone “V” =  × π r2h

As we are not given the value of h, we have to find it.

As it is a right cone, l2 = r2 + h2

h2 = l2 – r2

= (29)2 – (20)2

= 841 – 400

= 441

h2 = 441

h = √ 441 = 21cm

So now, we put the values of r and h in the above formula

We get, V =  × π r2h

=  × π × (20)2× (21)

=  × × 400 × 21

= 8800

∴ volume of the given cone = 8800cm3

hope this answer was helpful