A machine part consists of two cylinders aligned along the same vertical axis. A scale drawing of the part is represented below. The part is cut in half through the vertical axis. What is the total area, in square inches, of the actual two-dimensional cross-section that is the result of the cut?

Melinda's candy bar is in the shape of a triangular prism. She cuts her candy bar parallel to its bottom. The dotted line in the picture below represents Melinda's cut. What is the shape of the cross section of Melinda's cut?

Barb has a jewelry box in the shape of a rectangular pyramid. The top opens at a cross section parallel to the base. What is the shape of the opening of the jewelry box?