making strange shapes from a circle and quadrilateral
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
