# Arbelos _Posted on Oct 23, 2018_ +-- {.image} [[Arbelos.png:pic]] > The red line, of length $2$, is perpendicular to the bases of the three semicircles. What's the total shaded area? =-- * Thread [on twitter](https://twitter.com/Cshearer41/status/1054674051388661760) * [[arbelos techniques]] * [[arbelos solution]]