You want to wrap a gift shaped like the regular triangular prism shown. How many square inches of wrapping paper do you need to completely cover the​ prism? In a triangular prism, the front and back faces are triangles and the other faces are rectangles. In the front face, the base has length 10 inches. A dashed line joins the top vertex to the bottom side. The dashed line makes a right angle with the bottom side and has length 8.7 inches. The rectangular face on the right has height 14 inches.