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:
[tex]A = n \frac{1}{2} r^2 sin \beta
or
A = n \frac{1}{2} a h[/tex]
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 [tex]A = \frac{ π d^2}{4} [/tex]
where r is the radius, d is the diameter
Area of a Cyclic Quadrilateral:
[tex]A = \sqrt{(s-a)(s-b)(s-c)(s-d)} [/tex]
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
