Right Triangles. Fold another square from corner to corner (Fig. 3). This gives the diagonal. It also divides the squares into two right triangles.
To Form an Equilateral, or equal-sided triangle, fold a diameter at right angles to the lower side of a square, as in Fig. 4, for the angles of an equilateral triangle are always in
a line that would bisect the opposite side. Since the angles of this triangle must be equal, we fold the lower edge until one angle touches the diameter, as in Fig. 5. Then cut along the line a b. By duplicating this operation with the opposite corner, an equilateral triangle is formed.
To Form an Acute Triangle. Fold at right angles to the lower edge of the square, as in Fig. 4, to get the center; now fold from the upper end of the diameter to each of the lower angles, as shown by arrows in Fig. 7.
To Form an Obtuse Triangle. Fold one diagonal of the square, then fold the lower edge over until it touches the same line. Next cut the diagonal and the two folds to their point of intersection, as shown by dotted lines in Fig. 8.
To Form a Rhomboid. Take a square, fold a diagonal, then fold the left edge of the square so it will coincide with the diagonal. Then fold the right edge to coincide with the diagonal. Cut the last two folds, as indicated by the heaviest lines, as in Fig. 9.
To Form a Trapezoid.- Fold one diagonal of the square, then the lower edge so it will fall on the diagonal. Result, Trapezoid, Fig. 10.
To Form a Trapezium. Fold one diagonal. Then fold so that the lower edge of the paper will coincide with the diagonal. Now fold again so that the right edge will be on the diagonal. Cut the last two folds. Result, a Trapezium, Fig. 11.
To Form a Rhombus. Fold square same as for Trapezium. Then fold the shorter sides of the Trapezium over until they coincide with the diagonal. Cut the folds as indicated by the heavy lines, as shown in Fig. 12.
Sections
- Action Drawing
- Advice To Teachers
- Beginners Instructions
- Blocking In
- Clay Modeling
- Copying By Triangulation
- Decorative Ornamental Art
- Drawing From Nature
- Early Exercises
- Elementary Lines
- Elementary Perspective
- Expression Emotion
- Foreshortening
- Geometrical Form
- How To Draw Animals
- How To Draw Cartoons
- How To Draw Charcoal Crayon
- How To Draw Flowers
- How To Draw Women Men Children
- Lettering
- Light And Shade
- Materials For Drawing
- Models Measurements Proportions
- Outlines For Beginners
- Paper Folding Cutting
- Pen And Ink Drawing
- Principles Of Composition
- Simple Story Pictures
- Solid Black Effects
- Stimulating Imagination
- Tracing Transferring
- Two Handed Exercises