That depends on the shape for which you want to calculate the area. A few of the most common ones:
circle: a = πr2
square: a = l2
rectangle: a = l×w
ellipse: a = π × r1 × r2
triangle: a = bh/2
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length x width = area
Calculate the area to be covered. (A) Calculate the area per board or pack (B) Divide (B) into (A)
To calculate plinth area of a house, you would calculate the thickness of walls that external along with the entire carpet.
Calculate the round column shuttering
by adding together the area of its parts