Draw a line CD. Take any point M on the line. Using a protractor, draw a line perpendicular to the line CD at the point M.

Explanation

### Step-by-Step Solution:

1. **Draw a Line CD**:
- Use a ruler to draw a straight horizontal line on your paper. Label the ends of the line as point C and point D.

2. **Choose a Point M on the Line CD**:
- Select any point on the line CD. This point will be labeled as M.

...