For a symmetric looking Venn diagram, you would like 3 equally sized and spaced circles.

- Start by creating a triangle, whose vertices will be the centers of the circles.

- Select the three sides and use
**Constrain / Congruent**. - Draw circles centered at the vertices of the triangle.

- One at a time select each circle and use
**Constrain / Radius**. Specify the radius of each to be r. - Dragging one circle's circumference point now changes r and the size of all 3 circles.
- Select
the original triangle, along with the radius constraints and any points
you do not wish to show up in the picture and use
**View / Hide**.

Having drawn the circles, set the properties of each so that it has a
different fill color, and is, say, 70% transparent. Transparency will
automatically give different colors for the intersection regions.

Note
that if you use transparency, when you copy into Word on a PC, you
should Paste As a bitmap, as Windows Metafiles do not handle

transparency.

If you want to highlight only a single region, you use a different technique:

- Use
**Draw / Point** and ensure both circles are highlighted to create points at the appropriate intersections. - Use
**Draw / Arc** and drag from one point along the appropriate circle to the other to create arcs between these points - Select the arcs and use
**Construct / ****Polygon**