Results 1 to 3 of 3

Math Help - Problem

  1. #1
    Newbie
    Joined
    Oct 2009
    Posts
    14

    Problem

    what is the answer 4 this question?
    If the circumference of a coin is 7.7 what is the radius? what should I do frist
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Apr 2009
    Posts
    136
    Awards
    1
    Circumference of a circle is given by pie multiplied by the diameter.

    in this case

    pie times diameter = 7.7

    diameter = 7.7 / pie

    you are asked to find the radius

    radius is half diameter
    Follow Math Help Forum on Facebook and Google+

  3. #3
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    Quote Originally Posted by chika View Post
    what is the answer 4 this question?
    If the circumference of a coin is 7.7 what is the radius? what should I do frist
    C = 2\pi r \: \: \therefore r = \frac{C}{2\pi} = \frac{7.7}{2\pi}

    The above is the exact answer, your calculator may give you a rounded decimal answer
    Follow Math Help Forum on Facebook and Google+

Search Tags


/mathhelpforum @mathhelpforum