It is a rectangle which is similar to the base.
Circle
rectangle
When a sphere is cut with a vertical angled plane, the cross-section will be an ellipse. If the sphere is then cut by a horizontal plane, the cross-section will be a circle. Thus, the combination of these two cuts results in an elliptical cross-section from the angled cut and circular cross-sections from the horizontal cuts at various heights.
It is sometimes referred to as the shape's "plan".
It is a rectangle which is similar to the base.
If the cylinder is standing on its flat face, the horizontal cross section is a circle. Otherwise, it is a line or a rectangle.
Circle
rectangle
When a sphere is cut with a vertical angled plane, the cross-section will be an ellipse. If the sphere is then cut by a horizontal plane, the cross-section will be a circle. Thus, the combination of these two cuts results in an elliptical cross-section from the angled cut and circular cross-sections from the horizontal cuts at various heights.
A circle
a square
cone
a square
It is sometimes referred to as the shape's "plan".
No because it would be smaller.
They are all circles. The vertical and horizontal have the same radius as the ball while the angled cross section has a smaller radius.