Tangents on a circle
Move the points A, B, C and D around the screen. Notice what happens to the angles and lengths as this happens.
Consider the statement 'a tangent is a line that crosses a circle', is this... ?
A tangent is a line that touches a circle at one point
In the diagram, what is the relationship between the two line segments [BC] and [BD]?
In the diagram, what is the relationship between the angles ACB and ADC?
Under what condition are [BC] and [BD] equal?
Under what condition is angle BCD 90 degrees?
In the diagram, what shape(s) can the points A, C, B and D make?
What can be said about the points A, B and C?