tims quiz grades for the marking period are 75 83 78 94 and 70 he score a 63 on his next quiz by how much will his mean score de
1 answer:
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Answer:
3 cm
Step-by-step explanation:
So the area of the total circle is:
If you remove the outer band you have the area of the inner circle
This means that the inner circle had an area of
area = pi * r^2
9 pi = pi * r^2
r =
So the radius of the inner circle is 3.