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.

[b]'[color=#ff0000]Pixar in a Box[/color]'[/b] has similar materials about modelling and 'weighted averages' -> [url=https://www.khanacademy.org/partner-content/pixar/environment-modeling-2]see the page on Environment Modeling[/url][br]https://www.khanacademy.org/partner-content/pixar/environment-modeling-2