A cross section of a rectangular pyramid is made perpendicular to the base and through the vertex as shown. Describe the shape and dimensions of the cross section. Use the drop-down menus to explain your answer. A triangular prism with a rectangular base. The base measures 5 centimeters by 12 centimeters. The height of the prism is 8 centimeters. A vertical triangular cross section is drawn through the prism from the top vertex to the base of the prism parallel to the 5 centimeter side of the base.