Fourth side of a quadrilateral
How to find the fourth side of ANY Quadrilateral when 3 sides and the two angles between them are given.
Pythagorean Theorem by Tessellation # 76 Tiling
Equilateral Triangle Construction
Multiplying by numbers using vectors
[+Quantum Continuum]: En - [graphical method]
9.1.3 Pre #1103407 option B