Geometry

Point coordinates
Midpoint between two points
Distance two points
Slope of a line
Angle definition

Angle bisector
Median
Altitude and the Orthocenter of a triangle
Triangle bisector
Pythagorean theorem
Pythagorean triples
Circle
Square
Rectangle
Rhombus
Parallelogram
Trapezoid

Sphere
Spherical ring
Spherical segment
Spherical sector
Cone
Pyramid