The figure shows the intersecting circles O
and O' at A and B. AB is the diameter of circle O', CD is perpendicular
to AB and EDF is perpendicular to OD. Prove that angles ACF and BCE are
congruent.
![Intersecting circles, Diameter, Perpendicular, Angles, Congruence](p701_circles_angles.gif)
Art of Geometry Problem 701 using Mobile Apps. Circle Patterns
![Art of Geometry Problem 701 using Mobile Apps. Circle Patterns](p701_circles_angles_mobile_apps_circle_pattern_7.jpg)
Art of Geometry Problem 701 using Mobile Apps. Circle Patterns
Geometric Art using iPad or Mobile Apps
Geometric art is a form of art based on the use and application of geometric figures. A geometric figure is any set or combination of points, lines, surfaces and solids.
A mobile app or mobile application software is a computer program designed to run on smartphones and tablet computers.
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