Stage: 4 and 5 Challenge Level: 
Look for symmetry.
Make a conjecture.
To prove it, draw some radii.
Can you see any similar triangles?
Scale factors. Rotations. Interactivities. Dynamic geometry. Radius (radii) & diameters. Isosceles triangles. Tangents. Compound transformations. Similarity. Reflections.
Published October 1998,September 2008.
Copyright © 2007. University of Cambridge. All rights reserved.
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email: nrich@damtp.cam.ac.uk
