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Better Coupon
Author:
John Golden
When is the 20% off the whole order better than the 30% off your most expensive item? Can you tell in general?
GeoGebra
New Resources
Stairs (Optical Illusion)
Ellipse, Hyperbola and Circle as Envelopes
Angles and Intersecting Lines: Quick Investigation
"Compressed" Astroid as Envelope
Teorema Japonês para quadriláteros inscritos em uma circunferência
Discover Resources
Technology for Calculus
Polygon
Equation of a Circle with Center (h,k)
Vj 1.25
Quiz calculate sine, cosine functions
Discover Topics
Matrices
Planes
Geometry
Cone
Quadratic Equations