SOLUTION: Two concentric circles have circumferences 30pi & 40pi. Find the area of the ring-shaped between them. What are my steps to solving this problem?

Question 678210: Two concentric circles have circumferences 30pi & 40pi. Find the area of the ring-shaped between them.
What are my steps to solving this problem?
Answer by pmatei(79) (Show Source): You can put this solution on YOUR website!
Step 1: Find the radius of each circle.

Step 2: Find the areas of the 2 circles.

Step 3: Subtract the smaller circle area from the bigger circle area.

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