Rule

- 1.
- Choose a point $S$. Using your protractor, draw a circle with $S$ as the center at the desired radius.
- 2.
- Choose a point $P$ on the circle boundary and draw a line through $S$ and $P$. Call the line $l$.
- 3.
- Construct a normal to $l$ through the point $P$. Name the normal $t$. This is the tangent to the circle at the point $P$.