For a right cone, it is a hyperbola which becomes and isosceles triangle when the section passes through the apex.
No. Some of the classic curves studied by mathematicians: ellipses, hyperbola are cross sections of a cone taken at an angle.
The cross section will be a triangle with base 2 feet and a vertical height of 9 feet.
The answer depends on the angle at which the axis of the cone intersects the cross-sections.
If it a right cone then it is a circle, otherwise an ellipse.
It is a square.
Cross section of a Cube90 Degree Vertical & Horizontal cross sections of a Cube are square. Brahmajyothi