# 3-D Drawing and Geometry

### by Cathi Sanders

#### A Math Forum Summer Institute Project

1998 Summer Institute || Participant Projects || List of Participants || Sum98 Staff || Agenda

## Oblique Drawing

Another type of drawing is an oblique drawing. Compare the two oblique grids below. What types of lines are the same in each grid? What types of lines are different?

If you answered as follows, you are correct:

• Both oblique and isometric drawings have a set of vertical lines.

• Oblique drawings have a set of 45° lines and a set of horizontal lines, while isometric drawinGs have two sets of 30° lines.

• Isometric drawings have no horizontal lines.

You can use an oblique grid to draw many different shapes. Here are some examples of simple shapes drawn using an oblique grid, and a large oblique grid to print out and use to create your own isometric drawings.

When you use the grid, place a piece of unlined blank paper (or tracing paper) over it and use a pencil to sketch on the tracing paper, following the lines of the grid. If you draw on blank paper or tracing paper, you can remove the grid from beneath your drawing and the drawing will look much nicer than if you draw directly on the grid. Begin with simple shapes and then combine shapes to form more complex drawings.

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