Aslice is made parallel to the base of a right rectangular pyramid, as shown. what is the area of the resulting two-dimensional cross-section? enter your answer in the box.

rectangular pyramid intersected horizontally by a rectangle. the front edge of the base of the pyramid is labeled 7 millimeters, and the right edge is labeled 4 millimeters. the height of the pyramid is labeled 5 millimeters. the part of the larger rectangle that intersects the pyramid is a smaller gray rectangle. the front side of the smaller rectangle is labeled 3.5 millimeters, and the right side is labeled 2 millimeters.