It is its surface area.
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That is called the area.
Yes. Square rooting is when you figure out which number multiplies by itslef to create the number you need. In this case that number is 9. 3x3=9. so 9 is what would be called a perfect square
quadrilateral
When a number is multiplied by itself it is called the square of the number. It is called a square number as the number of dots or points represented by the number can be arranged in a square.
It is the area of the figure.