Problem 665: Intersecting Circles, Secant, Tangent, Angles, Mind Map

Online Geometry Problems

The figure shows the intersecting circles O and O', the common chord AB and the secant CAD. CE and DE are tangent to circles O and O' at C and D, respectively. Prove that the measure of angle ABE is equal the difference of measure of angles EDC and ECD.


Intersecting circles, tangent, secant, angle


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