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how can i find the circumference of a quarter circle using its area?

k, i have to find the circumference, diameter and radius for a quarter circle with an area of 19.93. im sorry, i usually figure these out myself, but im so stuck on this one:( any help would be appreciated. thnx<3

A=pi r^2, so knowing that you can figure out what the radius is by reworking the equation to get r by itself. once you get that, just plug and chug the numbers to get the radius. knowing that you can figure out the other things easily.

This entry was posted on Thursday, December 31st, 2009 at 12:47 pm and is filed under circle area. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

6 Responses to “how can i find the circumference of a quarter circle using its area?”

  1. area=1/4(pi)r^2
    u can put d values n can find out the radius
    19.93=(22/28)r^2
    hence can get d value of r
    n further u can find out circumference by using the formula C=2(pi)r
    u will get all ur answers
    References :

  2. A=pi r^2, so knowing that you can figure out what the radius is by reworking the equation to get r by itself. once you get that, just plug and chug the numbers to get the radius. knowing that you can figure out the other things easily.
    References :

  3. If it has the area of 19.93 then the area for a full circle is 79.72

    79.72=pi r^2
    25.3=r^2
    r=5.04

    D=2r
    D=10.07

    C=pi d /4 (quarter circle)
    C=2.52pi
    C=7.91
    References :

  4. Area = pi*r^2 = 19.93 so,
    r = sqrt(19.93/pi) = 2.518 = radius
    diameter = 2*radius = 5.037
    Circumfrence = 2*pi*r = 15.8255 and for a quarter circle just divide by 4
    1/4 circle circumfrence = 15.8255/4 = 3.9564
    The diameter is for a full circle, it doesn’t make sense to have a diameter for a 1/4 circle
    References :

  5. area= pi*radius^2
    4*19.93= pi*radius^2
    79.72= pi*radius^2
    79.72/pi= radius^2
    squared root of (79.72/pi) = radius

    now use this value of the radius on the equation:
    Circumference= 2*pi*radius
    and you will get the answer
    References :

  6. Well, you know that the area of a circle = pi *r^2

    So set the area equal to pi *r^2

    pi *r^2 = 19.93
    divide by pi
    r^2 = 6.344
    r = 2.519

    The radius is half of the diameter, so the diameter = 5.037

    To find circumference, the formula is pi * diameter

    So, pi * 5.037 = 15. 825

    Radius = 2.519
    Diameter= 5.057
    Circumference = 15.825
    References :

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