Question

Q. The highht of a cone is 4/3 of the diameter of its base. If the volume is 81π cm cube,then the radius of its base is​

Answer 1

Answer: 9/2

Step-by-step explanation:

Let Height = h, radius = r

Now, $(1/3)\pi *r^{2} * h = 81\pi$

and $h = (4/3) * 2r$ = $8r/3$

So, $r^{3} * 8/9 = 81$

Hence, r = 9/2