# Pentagon with two Semi-Circles _Posted on Jan 14, 2019_ +-- {.image} [[PentagonwithtwoSemiCircles.png:pic]] > The regular pentagon is tangent to both semicircles at the point where the three meet. What's the angle between the bases of the semicircles? What if I started with other regular polygons? =-- * Thread [on twitter](https://twitter.com/Cshearer41/status/1084862179696889856) * [[pentagon with two semi-circles techniques]] * [[pentagon with two semi-circles solution]]