Watch the video BryonyTriangle.mp4 in which Bryony demonstrates how to make a flower from a square of paper. (If you can't see the control bar, zoom out in your browser.)
She then sets you a challenge: what fraction of the original square of paper is the shaded triangle?
The correct answer is 32. Here is a picture to illustrate how the answer could be found. Well to to Nkoni for getting this correct and Shaun for having a go.