# Each tangent is perpendicular to the radius that goes to the point of contact

- Author:
- Aine Lyons

- Topic:
- Circle

## Each tangent is perpendicular to the radius that goes to the point of contact

Use the information you know to prove that the line AD is perpendicular to line h. (*hint* this is an indirect proof, and is proved by contradiction) *hint* prove that AE > AD Why is the line AF = AD

## Each tangent is perpendicular to the radius that goes to the point of contact

## Instructions

In today's class, you are going to try and figure out whether or not each tangent is perpendicular to the radius that goes to the point of contact.
Use the toolbar to work away and figure out whether this statement is true or false.
Use the angle measurements to check your answers.
Best of luck.