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Pre-Calc (Circles). Please help :(

Five concentric circles with radii 1, 2, 3, 4, and 5 are drawn as shown dividing the circle of radius 5 into five regions: a circle of radius 1 and 4 annuuli (rings). What is the probability that a point chosen randomly from within the circle of radius 5 lies in the annulus whose inner radius is 3 and who outer radius is 4?

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  1. the area of C5 = 25π
    The area of the annulus between C3 and C4 is 16π-9π = 7π

    so, p = 7/25

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