Stage: 2 Challenge Level: 
How many trapeziums, of various sizes, are hidden in this picture?
(By the way, some of us here at NRICH think they should be called trapezia . What do you think?)
Investigations. Addition & subtraction. Factors and multiples. Working systematically. Practical Activity. Trapezia. Visualising. Interactivities. Combinations. Multiplication & division.
Published April 1999.
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
