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The area of a square piece of cardboard is 81 square inches. What is the length of the cardboard?

User Agibsen
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The square root of 81 is 9. 9*9=81. The length is 9 inches.
User MTilsted
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By definition, the area of a square is given by:


image

Where,

L: length of the sides of the square.

Substituting values we have:


image

From here, we clear the value of L.

We have then:


image

Answer:

the length of the cardboard is:


L = 9 in

User Pyano
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