Semicircle: Geometric Shape, Pythagorean Theorem, Circle, Arc, Polygon, Area, Right Triangle

Kepler Triangle: Special Right Triangle, Geometric Progression, Mathematician, Pythagorean Theorem

Van Aubel's Theorem: Quadrilateral, Square, Right Angle, Thébault's Theorem, Napoleon's Polygon, Triangle

Equable Shape: Two dimensional, Area, Perimeter, Right Triangle

Hypotenuse: Pythagorean Theorem, Right Angle, Square (algebra), Root