Copyright © University of Cambridge. All rights reserved.

'Weekly Problem 43 - 2009' printed from http://nrich.maths.org/

Show menu


The diagram has rotational symmetry of order four about $D$.


If angle $ABC$ is $15^{\circ}$ and the area of $ABEF$ is $24$cm$^2$, what, in cm, is the length of $CD$?

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.

View the previous week's solution
View the current weekly problem