Fourth Year Drawing by D. R. Augsburg Fourth Year Drawing by D. R. Augsburg    

Lesson 3: Angles, Triangles, and Rectangles (Form)

lesson image

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.