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    Sarah01's Avatar
    Sarah01 Posts: 11, Reputation: 1
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    #1

    Feb 1, 2008, 11:01 AM
    Measurement of a radius.
    Suppose a chord in a circle is 80 centimeters long and it is 30cm from the center of the circle. How could I find the measurements of a radius of the circle.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Feb 1, 2008, 11:23 AM
    Draw a line from the center of the circle to the middle of the chord. It has length 30 cm

    Now, draw a line from the center of the circle to the end of the chord. You now have a right triangle. See it?

    It has hypoteneuse length, which is the radius, of
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    Sarah01's Avatar
    Sarah01 Posts: 11, Reputation: 1
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    #3

    Feb 1, 2008, 11:55 AM
    I don't understand what happened to chors that is 80cm long.
    Sarah01's Avatar
    Sarah01 Posts: 11, Reputation: 1
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    #4

    Feb 1, 2008, 12:02 PM
    Ok Ok so I have to add 30 +40-180=110
    Because the answers are a. 30cm
    b. 50cm
    c. 80cm
    d. 110cm
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #5

    Feb 1, 2008, 12:10 PM
    What are you doing with 30+40-180? I more or less gave you the solution.

    Besides, 30+40-180=-110.
    wewed100606's Avatar
    wewed100606 Posts: 228, Reputation: 36
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    #6

    Feb 1, 2008, 12:20 PM
    The initial question is kind of vague... it doesn't say what part of the chord is 30 cm from the center and it doesn't say if the chord is touching any of the radius. Not enough info for a true solution.
    Sarah01's Avatar
    Sarah01 Posts: 11, Reputation: 1
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    #7

    Feb 1, 2008, 12:53 PM
    I got it the answer is 50cm.
    R=(30) square + (40) square
    R= square root (2500)
    =50


    Thank you
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #8

    Feb 1, 2008, 12:54 PM
    There's enough information if you are willing to fore go pedantry.
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