Math-probability

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A simple dartboard has three areas… the main board has a radius of 11 inches, there is a circle with a radius of 5 inches, and the bullseye has a radius of 2 inches. What is the probability of a random dart landing inside the bullseye? Round to the nearest thousandth.

I believe it is 2/18 or 0.11?? Please help :(

  • Math-probability -

    No, you have to do this on the basis of area (which is proportional to radius^2)

    pr(bullseye)=(2/11)^2

  • Math-probability -

    so it would be 0.0330??

  • Math-probability -

    I would have rounded to 0.00331

  • Math-probability -

    Rounded to the nearest thousandth -- wouldn't that be 0.033?

  • Math-probability -

    yes you are correct Ms. Sue, thank you both :)

  • Math-probability -

    You're welcome, Jen.

  • Math-probability -

    Oh i forgot to ask....would i use A=Pir^2?

  • Math-probability -

    You can use pi r^2 but since you are just taking ratios the pi will cancel.

    4 pi/121 pi = 4/121

  • Math-probability -

    thank you Damon :)

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