GraphicMaths - Triangles

There are 7 types of triangle divided into 3 main families - equilateral, isosceles, and scalene.

GraphicMaths - Drawing Sierpinski triangles

GraphicMaths - Congruent triangles

Pythagorean Theorem - Interactive proof Pythagorean theorem, Algebra equations, Theorems

Beautiful Pythagorean proofs you might have missed, Alex Lin

GraphicMaths - Sine rule

Pascal's Triangle: A Secret Unveiled, Harlan Brothers

Isosceles Triangle: Definition, Properties, Angles, Area, Formula, Examples - Kunduz

Pythagorean theorem proof by scaling

GraphicMaths - Rotational symmetry