Area puzzle
What fraction of the total area in this diagram is shaded?
Slide for the answer.
The solution I implemented above uses a few shear transformations to make it easier to find the areas of the triangles.
For more about shear transformations, see https://www.geogebra.org/m/yZQNWxs6.
I got this problem from Twitter. Thanks to Catriona Agg.
https://twitter.com/Cshearer41/status/1646814725240487937