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storchak [24]
2 years ago
15

The diagram below shows a sign that Annie designed. It is made of two circles that share the same center. Annie wants to use str

ing to create a border around the outermost edge of the sign. About how many inches of string does Annie need?

Mathematics
1 answer:
Pavel [41]2 years ago
3 0

132 in

Step-by-step explanation:

  • Take the total radius = 18+3 = 21= R (say)
  • Simply use the formula for the circumference i.e. 2*pi*R
  • 2*22/7*21= 132
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kramer

Hey there! I'm happy to help!

We want to get c all by itself on one side of the equation. Usually variables go on the left side, so let's flip the equation around.

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If we multiply c/9 by 9, the 9 will cancel out because if you divide by 9 and then multiply by 9 it just equals 1. We can do this to isolate the c, but whatever you do to one side of the equation, you have to do to the other. So, we multiply both sides by 9.

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Have a wonderful day! :D

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