# Dynamic Geometry 1454: Intersecting Circles, Perpendicular Lines, Cyclic
Quadrilateral

Given circles O and Q intersecting at B and D. A, B, C are
collinear points and A, D, E are collinear points. Prove that AO is perpendicular to CE.

## Static Diagram of problem 1454

## Poster of the problem 1454 using iPad Apps

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Interactive step-by-step animation using GeoGebra

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