Tessellation from squares
A tessellation based off squares. Drag points C and D to change the shape of the yellow polygon poly2. can redefine poly2 as any shape, as long as it goes through the 4 vertices of the green square.
Open Middle: Distance, Midpoint, Slope (3)
Sine, Cosine, Reference, Coterminal
Inexact differential/integration by parts
LCM and GCD