1. Open Design Wave
2. From the File menu select New
3. Choose Design
4. Select OK
5. Maximise the screens
6. Choose the Create Rectangle tool.
7. Move the pencil cursor to the workplane (Green rectangle with arrow on).
8. Move to just inside the top left of the green rectangle.
9. Press and hold and drag the cursor down to the right to create a rectangle. Release the mouse button to finish creating the rectangle.

1. Choose the Constrain Separation tool
2. Move over a side of the rectangle (The selected line goes light blue)
3. Select the line by clicking the left mouse button. (The line turns red)
4. Select the opposite line, press, hold and drag the cursor to create the constraint outside the rectangle
5. Repeat on the other two lines that make up the rectangle
6. Double-click the left mouse button on the constraint to open the Properties dialogue window.
7. Enter a length of 150mm for the length and then repeat on the other constraint to set this to 75mm. These will constrain the dimensions of the rectangle.

1. Choose the Select Lines tool
2. Select the shortest side of the rectangle (right hand side) Cursor changes to an arc
3. Hold the left mouse button down and drag out the line to form an arc

Fig 3.

1. From the View menu choose Plan
2. Choose the Select Lines tool
3. Draw two lines from the ends of the rectangle to form a triangle.
4. Select the line that forms the base of the triangle
5. Delete the line using the Del key