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

Row and Column Views of Systems of Linear Equations
Random Polar Curve (1)
seo tool
Trammel of Archimedes Art
Slope Between 2 Points (Phase 2)

Discover Resources

Geometry Project #1
RotationP4
Rotations mini video
ABECEDA, 9-GON
Non-obvious Geometrical Properties of a Triangle

Discover Topics

Plane Figures or Shapes
Straight Lines
Mode
Diagrams
Arithmetic