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Of what area are you actually asking anyway?
Here's some though:
Area of a square:
A = s²
where s is the length of one side
Area of a rectangle:
A = lw
where 'l' is the length and 'w' is the width
Area of a triangle:
A = 1/2 bh
where b is the length of the base and h is the length of the altitude or the height
Area of a regular polygon:
A = n \frac{1}{2} r^2 sin \beta
A = n  \frac{1}{2} a h
where β=360/n
n is the number of sides, r is the radius of the circumscribing circle,
a is the length of one side of the polygon, h is the altitude or the height
Area of a circle:
A =π r²  or   A =  \frac{ π d^2}{4}
where r is the radius, d is the diameter
Area of a Cyclic Quadrilateral:
A =  \sqrt{(s-a)(s-b)(s-c)(s-d)}
where s is the semiperimeter or half of the total perimeter
and a,b,c and d are the length of the sides of quadrilateral

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Multiplication is the best formula
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