Geometry: Presentation
https://docs.google.com/document/d/1tWP3hAj-g4PmSAr2Ey20pHzw8J9XQUgIr1MG8ylvYAU/edit?usp=sharing
explanation and equation
Geometry: Worksheet
https://docs.google.com/document/d/1-gCEvZdJ1GPI_QKbByFpdE0VGUCRU8zqGPZCmP8chMI/edit?usp=sharing
