Euclid's Fifth

Euclid's Fifth Postulate

Adjust the sliders to change the size of alternate angles n and m. Can you find the relationship between n and m to decide which side of XY the lines AB and CD cross?

New Resources

'Einstein' tile vitral
Determinant Equation of a Line
Curves
Noisy loop
Multiplying 4-Digit by 3-Digit Numbers Using an Area Model

Discover Resources

Volleyball Problem
Chord & Arc Properties
Solids - Isosceles right triangle cross-sections
angles and circles: geogebra
Planes and 3D stuff

Discover Topics

Vectors
Differential Calculus
Unit Circle
Root
Fractal Geometry