The figure below shows the circles O1
(radius r1) and O2 (radius r2). A1A2
and B1B2
are the common
external tangents and CD is a common internal tangent. Circle O3
(radius r3) touches A1C, CD, and circle O1.
Circle O4 (radius r4) touches B1D, CD, and circle O1.
Prove that
.
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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Original problem
1099.