2D Shapes Area and Perimeter Calculator

It is a powerful calculator which calculates area, perimeter and the centroid of 20 regular 2 dimensional shapes as listed below. Also performs the reverse calculation i.e. if area is known find the other parameters.

Supported Shapes are
Square
Rectangle
Parallelogram
Trapezoid(or Trapezium)
Isosceles Triangle
Equilateral Triangle
Right Triangle
Scalene Triangle
Rhombus
Circle
Circular Sector
Circular Segment
Annulus
Ellipse
Regular Pentagram (Five Pointed Star)
Regular Pentagon
Regular Hexagon
Regular Octagon
Regular Heptagon (iPad Only)
Regular Nonagon (iPad Only)