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Multiply the length of any side by itself ("square" it). To find the are of any rectangle, including a square you multiply the length by the width, e.g. if it is a 5cm square the area is 5x5=25cm2. If it's a rectangle with a 3cm x 5cm the area is 3x5 = 15cm2.
Square root the area. The length and width of a square are always the same and length times width is the area so this is how you get the area.
The size or length of a square is related to its area as the area of a rectangle s the product of the length times the width. As a square is a special type of rectangle, where the length is equal ti the width, the area of a square is the length times the length or length^2, also spoken as "length squared".
A square with a side length of 4cm has an area of 16cm2
For a rectangle or square, Area = Length * Width So Length = Area / Width.