Let's call the initial radius r1 and the second radius is r2. And we know that r2=1.6 r1.
The volume of the first cone can be calculated by V = π r1^2 h /3
The volume of the second cone can be calculated by V = π r2^2 h /3
If we replace r2 by using r2=1.6 r1 then we get:
V = π (1.6r1)^2 h /3
or V = π 2.56(r1)^2 * h /3
And so we see that the volume of the second cone is now 2.56 times bigger than the first
