A=pi(r)^2
45=pi(r)^2 divide by pi (3.14)
14.33=r^2 square root both sides
3.79=r round
r=4
Answer: 
<em>Your Answer Is...</em><em> </em>2
Step-by-step explanation:
<em>Simplify the radical by breaking the radicand up into a product of known factors, assuming positive real numbers.</em>
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Hopefully this helps <em>you!</em>
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<u>- Matthew ~</u>