A hollow square pyramid side of base 50mm and height 70 mm, is resting on HP on its base with all the sides of its base inclined equally to VP. A square hole of side 22 mm is drilled through the pyramid. Sides of the square hole are equally inclined to HP. Axes of the pyramid and the hole intersect at right angle 22mm above the base of the pyramid. Axis of the hole is perpendicular to VP. Draw elevation, plan and development of the lateral surfaces of the pyramid.