quantity that expresses the extent of a two-dimensional surface or shape, or planar lamina, in the plane From Wikipedia, the free encyclopedia

**Area** is the amount of space a two dimensional (flat) surface takes up. It is useful because it is how much of a material is needed to make a hollow container. Area is the amount of surface covered by a close object or shape.

Some units used to measure area are square foot, square mile, square metre and square kilometre. The area of a planar figure is often written as .^{[1]} Areas of regular shapes such as square, rectangle, triangle and circle can be calculated through formulas.^{[2]} The area of an irregular shape can be approximated through grid or graph paper.^{[3]}

One can use different formulas to find the area of different shapes. For example:^{[2]}

- Area of a rectangle is the length of any two touching sides multiplied together. In other words, length times width.
- Area of a triangle is half of the base multiplied by the perpendicular height. In other words, .
- Area of a circle:

The area of a flat object is related to the surface area and volume of a three-dimensional object.

The area under a curve can be found using integration, a concept from calculus.

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