Areas in Geometry

Area of a Square

A = x2

where: A is the area and x is the side of the square

Area of a Rectangle

A = xy

where: x and y are the adjacent sides of the rectangle

Area of a Circle

A = Πr2

where: r is the radius of the circle and Π = 3.14

Area of a Triangle

There are three formulas:

First





where: b is the base of the triangle and h is the height which the perpendicular distance from the vertex to the base

Second

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where: a and b are two sides and C is the angle opposite to the third side c.

Third





Where a, b and c are the three sides of the triangle


and



or half the perimeter

Area of Trapezium

A = [(x+y)/2]h

where: x and y are the two parallel sides and h is the perpendicular distance between the parallel sides

Area of a Parellelogram

A = b x h

where: b is the base and h is the perpendicular distance of the opposite side from the base

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