Area of a region

Tara, this is not a homework service site. It is a math help site where we help students solve their own problems.
 
Tara123 said:
Please help solve
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Tara can you tell us what the relationship is between the radius of a circle and its diameter?
What is the area of a circle if one knows its radius?
If you don't know, please do tell what you do know about circles.
 
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