To find the length and width of a 20 square meter area, we need more information. If the area is a square, we can find the side length by taking the square root of the area. The square root of 20 square meters is approximately 4.47 meters. Therefore, if the area is a square, both the length and width would be approximately 4.47 meters.
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You can't tell the dimensions from the area. There are an infinite number of possible
sets of dimensions.
Here are a few of them. All of these rectangles have areas of 20 square meters:
1 x 20
1.25 x 16
2 x 10
2.5 x 8
3.125 x 6.4
3.2 x 6.25
4 x 5
The area of a rectangular garden is length * width. You have 200 = Length * 20, and so Length = 10 metres. Conventionally, for a rectangle, the length is the longer of the two dimensions, though for a garden, it is often the distance from the back of the house to the end of the garden that is referred to as the length - even if it is the shorter dimension.
A square meter is a unit of area. Suppose we only consider quadrilaterals of a given area, say 16 square meters. This is the area of the following rectangles (among others): 1 by 16 meters, 2 by 8, 4 by 4 (a square), 8 by 2, and 16 by 1. So to convert an area in square meters into a length and width pair, choose an edge length, and divide the area by that length to get the other edge length. Another example: Suppose we have a rectangle whose area is 20 square meters. Take one edge to be 5 meters, so you get 20/5 = 4 meters as its other edge.
To find the area of a rectangle, you multiply the length by the width. In this case, the length is 20 meters and the width is also 20 meters. Therefore, the area would be 20 meters x 20 meters = 400 square meters.
As a square it has a width of 20 feet and a length of 20 feet.
The perimeter of this square is 56.569 meters.