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9² = 81 square units.
Area= length*length= 9*9= 81 unit square

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Q: What is the area of a square with sides of length 9?
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What is the area of a square whose sides are 9?

A square with a side length of 9 units has an area of 81 square units.


How do we find the width of a square if you only have the area?

We know that every side of a square in the same length, and that the area is equal to the width times the height. Because this is a square, the width and height are equal, so area is equal to the length of one of the sides times itself, or the length of one of the sides squared. So, in order to find the length of one of the sides, you take the square root of the area. The length of the side is equal to both the width and the height. For example, if you have a square with an area of 9, take the square root of 9, which is 3. So the width of that square is 3.


What is the perimetre of a square if it has an area of 81 cm2?

If I'm correct, the area of a square, or any rectangle (a square is also a rectangle) = side x side. Since all sides of a square are = to each other, the area of a square = length of one side, squared. So you'd need the square root of 81 to find the length of one side = 9. Perimeter of an object is the sum of it's sides. Square has 4 sides, so 9+9+9+9 = 36


Length of a diagonal square with area of 81?

The length of a square with an area of 81 would be 9.


If the area of a square is 81 square inches what is its perimeter?

A square is a four sided polygon with four right angles whose sides are all congruent. This means that the area of a square is equal to the length of one side squared. So a square with an area of 81 sq. in. has a side length of 9 inches. The perimeter is the distance around the outside of a figure. For a square, this is equal to four times the side length. Here 4 * 9 = 36. So, the perimeter of this square is 36 inches.