Stage: 5 Challenge Level: 
Where is the belt a tangent to the circles? Draw in radii at these
points.
Short problems. Long problems. Tangents. Perimeters. Sine. Arcs, sectors and segments. Complex numbers. Pythagoras' theorem. engineering. Forces.
Published June 1998.
Copyright © 2007. University of Cambridge. All rights reserved.
NRICH is part of the family of activities in the Millennium Mathematics Project, which also includes the Plus and Motivate sites.
email: nrich@damtp.cam.ac.uk