Slicing a triangular prism

1. What is the shape of the cross section formed by slicing the triangular prism above with the horizontally (move the Rotate 1 slider all the way to the left where it says Horizontal)?

2. What is the shape of the cross section formed by slicing the triangular prism above with the vertically (move the Rotate 1 slider all the way to the right where it says Vertical)?

3. What is the shape of the cross section formed by slicing the triangular prism above diagonally (move the Rotate 1 slider to the middle)?