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3. The shadow cast on the ground by a vertical rod 5 feet high is 6$ feet in length. Find the height of a chimney whose shadow is 85 feet long. (Scale, inch to 1 foot.) 4. On a lirsB 8*75 inches long as hypotenuse describe a right-angled triangle having one of its &aute angles of 20°. Find a point within the triangle equidistant from all of its sides. On the shortest side of the triangle describe a heptagon. On the hypotenuse describe a parallelogram having an altitude of £ inch and one of its angles equal to the larger of the acute angles of the triangle. Describe a circle of $ inch radius to touch the remaining side of the triangle at its middle point. 6. Find the length of an. edge of a square piece of cardboard whose area is equal to the »€» of what remains of a piece of cardboard 5 inches square after a piece 3 inches square has been removed from it. 6. A block of wood 2 inches square sad 1 inch thick rests on the horizontal plane; it sop. ports another square block inch high, the corners of whose base coincide with the middle points of the edges of the larger block. A .square pyramid 2 inches high is placed on the smaller block so that the corners of its base coincide with the middle points of the upper edges of that block, Draw a plan of the gwup and an elevation of it on a vertical plane making an angle of 35° with a long edga of the larger block. ?. The plan ABCD is given of a square one ©f whose corners* B, rests on the horiKontaJ please, the diagonal A G being parallel to the horizontal plane. Find the true length of a side of the square m& the angle at which the surface of the square is inclined to the horizontal plane.