Find the volume of a pyramid or a cone, math homework help

Find the value of the variable in the figure. The diagram is not to scale.

Volume=8piπ

A cone has radius x and height 6, from the center of its base to its vertex. A right angle is indicated at the intersection of a line from the center of the base to the outside edge and a dashed line from the center of the base to the vertex.
6

x=