Three legged chair offer the same support as traditional chair with four legs, because the weight is distributed evenly between the legs. The seat of the chair is equilateral triangle.
Instruction to make three legged chair: cut a 1-inch piece of plywood in an equilateral triangle with sides of 18 inches. Make two the front legs of the chair and one the rear chair leg. Make the back of the chair. Make the supports of the chair legs. Sand the surfaces and edges of each piece.
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Cut semicircle invested in the corner of the seat. Drill a 1-inch hole through the sides of the front legs, the sides of the back leg, and the center of the back. Connect the front and rear legs by inserting the leg supports in the lower holes of the legs. Connect the top of the rear legs by inserting the supports of the seats in the upper holes of the legs.
Place the seat vertically above the upper ends of the front legs. Place the side of the leg in a semicircle around the back seat. Finally, to make three legged chair, insert the upper end of the leg hole in the backrest 3 inches.