a ball is resting inside a cone as shown. <0. Calculate the radius r cm of the ball. <0 - from bottom point to the centre = 18 cm. <0 whole length is 24 cm

Answer 1

"as shown" doesn't work here, so you will have to be more specific
in describing the problem.
e.g. What does <0 mean?
Do we know the radius of the cone?
Is "whole length" the height of the cone?
etc