# making strange shapes from a circle and quadrilateral

- Author:
- Arthur Lee

- Topic:
- Circle, Parametric Curves

Have some fun with the section formula (point of division). Use the slider to switch between a square and circle.

Click 'control' to display the original shapes. Drag the vertices to experiment with different starting quadrilateral.

**'Pixar in a Box'**has similar materials about modelling and 'weighted averages' -> see the page on Environment Modeling https://www.khanacademy.org/partner-content/pixar/environment-modeling-2