Stage: 4 Challenge Level: 
Can you find equal lengths?
Can you spot similar triangles?
These diagrams might help you to move forward. Cut the images out and sort them in a way that helps you see any connections.
Can you spot similar triangles?
These diagrams might help you to move forward. Cut the images out and sort them in a way that helps you see any connections.
Stage 5 - Reviewed 2012. Cosine rule. smartphone. Stage 5 needs dealing with. Pythagoras' theorem. Circles. Scale factors. Similarity. Long problems. Cartesian equations of circles.
Published March 2000,January 2009.
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