Weekly Problem 23 - 2008
A triangle has been drawn inside this circle. Can you find the length of the chord it forms?
Two intersecting circles have a common chord AB. The point C
moves on the circumference of the circle C1. The straight lines CA
and CB are extended to meet the circle C2 at E and F
As the point C moves what do you notice about the chord EF?
Give a proof of your conjecture.
Created with GeoGebra