There are 12 girls and 18 boys in a class. Teacher wants to form groups with the same
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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
