Math 9: Tangents to a Circle
- Author:
- sloucks
- Topic:
- Circle, Geometry, Tangent Line or Tangent
Note that line segment AB is tangent to the circle at point D.
Move Point E around the circle to create a chord that passes through the centre of the circle.
What do you notice about the angle?
The Rule: A chord drawn perpendicular to a tangent at the point of tangency contains the centre of the circle and is a diameter.