Geometry
Areas, perimeters, figures
Circle Area
Compute area and perimeter of a circle from its radius
Rectangle Area
Area, perimeter and diagonal of a rectangle
Regular Polygon Area
Area and perimeter of any regular polygon
Triangle Area
Area and perimeter using Heron's formula (three sides)
Annulus Area
Area and perimeter of a circular annulus
Circular Sector Area
Area, perimeter and arc length of a circular sector
Ellipse Area
Area and perimeter (Ramanujan) of an ellipse
Hexagon Area
Area and perimeter of a regular hexagon
Parallelogram Area
Area and perimeter of a parallelogram
Pentagon Area
Area and perimeter of a regular pentagon
Rhombus Area
Area and perimeter from the two diagonals
Square Area
Area, perimeter and diagonal of a square
Trapezoid Area
Area and perimeter of a trapezoid