Question

the radius of a cone is 20cm and height is _____ cm​

Answer 1

Answer:

             " h = 3V/π$r^{2}$  "

Where ,

h = height of cone

v = volume

r = radius of cone

You can have your conclusion from this .

Answer 2

When a small cone is cut off from the top of the cone, the ratio of the radii of the bases is equal to the ratio of the heights. Hence, the height of the small cone = H/2 = 10 cm.

~Will be glad for you if it helps~