Area is a measure of the size of a 2-dimensional surface. For example in the rectangular shape on the right is 8 meters wide by 2 meters high. As you can see it can hold 8 square meters. So we say it has an area of 8 square meters. This is written sometimes as

Areas of plane shapes

For many shapes there are ways to calculate the area - for example the area of a circle. These are listed below with links to pages that explain each in more depth.

See also

• Surface area of solids

Square		See Area of a square
Rectangle		See Area of a rectangle
Triangle		See Area of a triangle
Triangle (SAS)		See Area of a triangle (sas)
Triangle Given 3 sides	See Heron's formula	See Heron's formula
Equilateral triangle		See Equilateral area
Parallelogram		See Parallelogram area
Trapezoid		See Trapezoid area
Rhombus	3 methods See Area of a rhombus	See Rhombus area
Kite	where d1, d2 are the diagonals.	See Area of a kite
Regular polygon	4 methods See Area of a regular polygon	See Area of a regular polygon
Circle		See Area of a circle
Ellipse		See Area of an ellipse
Segment of a circle	See Area of a circle segment.	See Area of a circle segment
Annulus		See Area of an annulus

Areas on the coordinate plane

If you know the x,y coordinates of the vertices of a shape, there are ways to calculate the area from those coordinates. See Polygons on the coordinate plane.