



 
Hi, I can help get you started. Here is my diagram of the bull's eye, not to scale. The outside circle has a radius of $10 + 15 + 15 + 15 + 15 = 70$ cm. What is the area of a circle of radius 70 cm? The next smaller circle has a radius of $ 10 + 15 + 15 + 15 = 55$ cm. What is the area of a circle of radius 55 cm? The area of the largest ring, the red ring, is the difference between the two areas you just calculated. Penny  


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