Copyright © University of Cambridge. All rights reserved.

'Folding in Half' printed from

Show menu

See all short problems arranged by curriculum topic in the short problems collection

The shorter sides of a right-angled isosceles triangle are each $10$cm long. The triangle is folded in half along its line of symmetry to form a smaller triangle. How much longer is the perimeter of the larger triangle than that of the smaller?
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.