# Two Triangles and Three Concentric Semi-Circles _Posted on Jul 18, 2020_ +-- {.image} [[TwoTrianglesandThreeConcentricSemiCircles.png:pic]] > Two right-angled triangles and three concentric semicircles. What fraction is yellow? =-- * Thread [on twitter](https://twitter.com/Cshearer41/status/1284401488215900163) * [[two triangles and three concentric semi-circles techniques]] * [[two triangles and three concentric semi-circles solution]]