UHG39: Rational trigonometry: an overview:

(Rational number only)

This is a revolutionary approach (2005) to teach Secondary / High school Trigonometry by using purely algebra, no geometry and no picture, no sine, cosine, tangent, etc.

New concepts:

Vector as an order pair (x, y)

Quadrance = magnitude of vector

Perpendicular of 2 vectors

Parallel

Spread (angle between 2 vectors)

Amazon Book by the Dr. NJ Wildburger:

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