What shape would you have if you made a angled cross-section of a triangular pyramid?

If you make an angled cross-section of a triangular pyramid (also known as a tetrahedron), the resulting shape would typically be a triangle or a trapezoid, depending on the angle and position of the cut. If the cut is made parallel to one of the triangular faces, it will yield a smaller, similar triangle. If the cut intersects the pyramid at an angle, it may produce a trapezoidal shape.