
Area is defined as a quantity to
express the extent of a twodimensional surface or shape. It is
measured in square units e.g., cm^{2}
, m^{2}
The table given below shows formulae of some standard shapes.

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*When the height of triangle is not given, but all the three sides
are known, the area will be calculated by following formula.
Area = Sqrt {s (sa) (sb) (sc)}
where s = half of the perimeter
Perimeter is the sum of all the three sides of a triangle.
*If two sides and one angle is known, we can find the other sides by
using sine rule or cosine rule as the case may be.
Area of rhombus = (1/2) d_{1}d_{2}
; where d_{1} and d_{2}
are the diagonals of rhombus.
Area of segment of a circle = 0.5 R^{2}
(C  sin C) , where R is the radius of circle and C is the angle (in
radian) subtended by the segment at the center.
Area of a parabolic segment with its base
"b" and height "h" is given by, A= (2/3) b h 

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