Copyright © University of Cambridge. All rights reserved.
'Right Angled Octagon' printed from http://nrich.maths.org/
A quadrilateral can have four right angles. What is the largest number of right angles an octagon (8 sides) can have?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.