Answer:

Step-by-step explanation:
<u>Formula for circumference of a circle is</u>:
Circumference = 
<em>Given circumference of the ring is
</em>
<em>Now solving for the radius gives us:</em>

We know that area of a circle is
, substituting the value of r we found, we get the area as:
area (A) = 
Hence the Area (A), in terms of
is
Answer:
m=13
Step-by-step explanation:
156 divided by 12mph = 13 miles
Sqrt(45) is between sqrt(36)=6 and sqrt(49)=7.
Answer: between 6 and 7