# Activity #22__Construct a 30 - 60 - 90 Triangle

- Author:
- glassfordpeak

## Activity Goal

Construct the 30 - 60 - 90 triangle (shown below) and then find the missing side lengths.

## DIRECTIONS (if you need help)

1. Use the A = 30 (notice that the point B' appears; we will need to delete this point later).
3. Construct a Ray AB'.
4. Construct B = 90 (notice that the point A' appears, will delete this point also later) .
5. Construct Ray BA'.
6. Use the

**Segment with Given Size**tool to create the line segment AB with a length of 9. 2. Construct**Points**tool to choose the**intersect**tool and create the point C (where the two rays intersect). 7. Click**Steps Menu,**, hide the rays and the points A' and B' (unclick each) . 8. Now get out of the Steps Menu and back into the**Tools Menu**. 9. Use the**Polygon**tool to create the triangle ABC -- as shown above. 10. Use the**Move**tool, to find the lengths of side a and side b.