The instructor tells children:

• Form tells about the shape of objects.
• The simplest forms are triangles, rectangles, circles, ellipses, and ovals.
• These forms in mathematics are called geometrical forms, and in drawing, measures of form.
• These measures of form are common in animals and birds.
• When it comes to the triangle, "tri" means three and "triangle" means three angles.
• Thus, a triangle is a figure with three angles.
• To call out the general shape of each animal in the top picture.

The instructor:

• Asks children to study the image labeled "Angles, Triangles, and Rectangles."
• Tells children that right means straight, acute means sharp, and obtuse means dull.
• Uses their forefinger to make right angles, acute angles, and obtuse angles and asks children to name each one as they are made.
• Asks children to find these angles in their surroundings.

Children complete the following drill work:

1. Draw a right angle.
2. Draw an acute angle.
3. Draw an obtuse angle.
4. Draw a right triangle.
5. Draw an acute triangle.
6. Draw an obtuse triangle.
7. Draw a square rectangle.
8. Draw a vertical rectangle.
9. Draw a horizontal rectangle.
10. Draw a shed form.
11. Draw a house form.