If you looked at the bottom of a pyramid and saw a right triangle it would be a right triangular prism. It would have 3 triangular faces extending up from the bottom.
The last sentence refers to a right tetrahedron, not a prism. A triangular prism has two triangles at either end, and three rectangles joining them - like a pencil with a triangular cross-section.
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A triangular prism has two right angles. Each end of the prism, which is a triangle, has one right angle. The third right angle is formed where the two rectangular sides meet. So, in total, a triangular prism has two right angles.
14 if the triangular cross section has a right triangle, 12 otherwise.
A right triangular prism.
A right triangular prism.
A right triangular prism has two identical faces. Two faces may or may not be identical in an oblique prism, in which the lateral edges are not perpendicular to the bases.