Search

Google Classroom

GeoGebra Classroom

Home
Resources
Profile
Classroom
App Downloads

Umbra and Penumbra geometry, from observer's point of view

Author:flatearthmath

New Resources

The Gardener's Ellipse
Rule of Sarrus - Determinant of a 3×3 Matrix
רישום חופשי
Trammel of Archimedes Art
The Geometry of the Coefficients of a Quadratic Function

Discover Resources

resources to try 2015-2016
Geb's Pentagram with Golden Ratio Coordinate Proof
Mapping 5
An exploration of ratios of parts of a triangle
"Fly" Wheel

Discover Topics

Square
Function Graph
Logarithm
Vectors 2D (Two-Dimensional)
Rational Numbers

About Partners Help Center

Terms of Service Privacy License

Graphing Calculator Calculator Suite Math Resources

Download our apps here:

© 2026 GeoGebra®