How To Calculate Square Feet?

Square feet calculate the covered area by an object and the method to calculate the area of a square is: Square of the length of its side. For example if the length = 3 square foot then the answer is
Formula = length * length
=3x3 = 9

for rectangle the area is given by multiplying the length of the rectangle with its breadth. For example if the length = 5 square foot and breadth = 3 square foot then
Formula = length * breadth
=5x3 = 15 square feet

In case of a triangle the area can be found out by multiplying the base and height of the triangle and then dividing by 2.
For example if the base of the triangle = 4 square foot and height = 6 square foot
Formula = (Base * Height)/2
=(4x6)/2
=12 square feet