Triangle spread rules in action | WildTrig: Intro to Rational Trigonometry | N J Wildberger

We look at a quadrilateral problem using rational trigonometry and the Triangle spread rules. The triangle spread rules allow us to determine which of two solutions of the Cross law or Triple spread formula is appropriate in many situations.

This video is part of the WildTrig series, which introduces Rational Trigonometry and applies it to many different aspects of geometry.

Video Content:
00:00 A quadrilateral problem
3:36 Triangle spread rules
7:36 Applying the Cross law

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