Many of the problems in this feature include proof sorting activities which challenge you to rearrange statements in order to recreate clear, rigorous proofs.
Plus magazine has a selection of interesting articles exploring proofs in which pictures play an important role.
Pentakite
Quad in quad
Join the midpoints of a quadrilateral to get a new quadrilateral. What is special about it?
Kite in a square
The converse of Pythagoras
Can you prove that triangles are right-angled when $a^2+b^2=c^2$?
To swim or to run?
We are very grateful to the Heilbronn Institute for Mathematical Research for their generous support for the development of these resources.