If a cone is cut by a plane, can the cross section be a triangle? A right triangle? When the cross section is a circle

If a cone is cut by a plane, can the cross section be a triangle? A right triangle? When the cross section is a circle

If a cone is cut by a plane, can the cross section be a triangle
Can it be a right triangle? Maybe
When the section is a circle, can the section area be exactly half of the bottom area