TO FORM A SQUARE.
To cut a card of the shape and in the proportions of Fig. 79, into three parts, to form a perfect square, you must cut through the lines of the obtuse angle, and it will then be an easy task.
Fig. 80.
To cut a card of the shape and in the proportions of Fig. 79, into three parts, to form a perfect square, you must cut through the lines of the obtuse angle, and it will then be an easy task.
Fig. 80.