Brian’s backyard is in the shape of a square. If the yard is 21 feet long, how much land does Brian’s backyard cover?
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The ratio A/r² would represent 
which is the circumference of a circle divided by its diameter.
You can see this because the area of a circle isr² and if you divided that by the radius squared, you are given pi which is the circumference of a circle divided by its diameter.
You can see this because the area of a circle is