# Area Calculator

*The area of a surface* is the space occupied by a geometrical figure (whether an object is flat or two-dimensional).

Use these area calculators to calculate the area of geometrical figures like Triangle, Circle, Rectangle and Sphere.

## Area of a Triangle

**Area of a Triangle Formula:**

A= ½bh

where, *b* - the base of the triangle, *h* - the height of the triangle.

## Area of a Rectangle

**Area of a Rectangle Formula:**

A= l · w

where, *l* - length of a rectangle, *w* - width of a rectangle.

## Area of a Circle

**Area of a Circle Formula:**

A= Π r^{2}

where, *r* - radius of circle, *Π* = 3.142 (fixed value)

Alternate formula for the area is, A = Π · d^{2}/4, where *d* - the diameter of a circle.

## Surface Area of a Sphere

**Surface Area of a Sphere Formula:**

A = 4Πr^{2}

where, *r* - radius of circle, *Π* = 3.142 (fixed value)

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