If you know the volume then:
(3 * Cone Volume) / (PI * radius^2) = height
No.
The distance is |-5 -3| = 8 units. (Y-coordinates are the same, so the distance is measured entirely in the x-direction. Distance is non-negative.)
Yes it determine the length
The line segment is translated to the left across the square.
although an image would be useful
