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September 17, 2014

September 17, 2014

Posted by **Math's Noob** on Sunday, January 8, 2012 at 4:39pm.

Find the ratio of the shaded areas A (the second circle from the inside) and B(the outer circle)

(Hint: don't substitute for pi)

- Maths -
**Steve**, Sunday, January 8, 2012 at 4:50pmI assume

A is the area between the 2-cm and the 3-cm circles

B is the area between the 3-cm and 4-cm circles.

A = pi(3^2 - 2^2) = 5pi

B = pi(4^2 - 3^2) = 7pi

B/A = 7/5

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