Polygon area calculator

It uses the same method as in Area of a polygon but does the arithmetic for you.

Instructions

1. Enter the vertices in order, either clockwise or counter-clockwise starting at any vertex.
2. Enter the x,y coordinates of each vertex into the table. Empty rows will be ignored.
3. Click on "Calculate".

Unlike the manual method, you do not need to enter the first vertex again at the end, and you can go in either direction around the polygon. The internal programming of the calculator takes care of it all for you.

There are other, often easier ways to calculate the area of triangles and regular polygons. See

• Area of a regular polygon
• Area of a triangle (Given base and altitude)
• Area of a triangle (Heron's formula - given lengths of the three sides)
• Area of a triangle (By formula, given coordinates of vertices)
• Area of a triangle (Box method, given coordinates of vertices)

Limitations

Other Coordinate Geometry topics

• Introduction to coordinate geometry
• The coordinate plane
• The origin of the plane
• Axis definition
• Coordinates of a point
• Distance between two points

• Introduction to Lines
  in Coordinate Geometry
• Line (Coordinate Geometry)
• Ray (Coordinate Geometry)
• Segment (Coordinate Geometry)
• Midpoint Theorem

• Distance from a point to a line
• - When line is horizontal or vertical
• - Using two line equations
• - Using trigonometry
• - Using a formula

• Intersecting lines

• Cirumscribed rectangle (bounding box)
• Area of a triangle (formula method)
• Area of a triangle (box method)
• Centroid of a triangle
• Incenter of a triangle
• Area of a polygon
• Algorithm to find the area of a polygon
• Area of a polygon (calculator)
• Rectangle
• Definition and properties, diagonals
• Area and perimeter
• Square
• Definition and properties, diagonals
• Area and perimeter
• Trapezoid
• Definition and properties, altitude, median
• Area and perimeter
• Parallelogram
• Definition and properties, altitude, diagonals

• Print blank graph paper