Depends on the angle between the side and the base. The smaller the angle the larger the height.
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The slant height of a square pyramid is always perpendicular to the base. It is form the top vertex all the way down to the most center of one side of the base edge.
slant edge is a height of a cone
5.5^2*3.25/3
Volume of this pyramid is (area of base) x (height) / 3. The area of the base (square) is (edge)2 So (21 ft)2 * (18 ft)/3 = 26586 cubic feet
The lateral face for a prism or pyramid is any edge or face which is not part of a base.