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Math Help - [SOLVED] circle tangents

  1. #1
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    [SOLVED] circle tangents

    I'm having trouble with two problems that have tangents.

    1. Given: The radius of circle O is 0.7; The radius of circle P is 1.1; Line AB is a common internal tangent; AB = 2.4
    Find: a. OP; b. The distance between the circles.


    2. Given: Diagram as marked with line PA and line PD tangent to circle O.
    Find: a. arc AD; b. measure of angle P
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  2. #2
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    Quote Originally Posted by poison741 View Post
    I'm having trouble with two problems that have tangents.

    1. Given: The radius of circle O is 0.7; The radius of circle P is 1.1; Line AB is a common internal tangent; AB = 2.4
    Find: a. OP; b. The distance between the circles.


    [SOLVED] circle tangents-capture.jpg

    Since the line AB is tangent to both circles we know that the line segment from the center of the circle to the tangent lines are right angles.
    So the above triangles have three equal angles so they are similar triangles.

    so

    \frac{x}{.7}=\frac{y}{1.1} and x+y=2.4

    Just solve this system Good luck.
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  3. #3
    Behold, the power of SARDINES!
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    That was weird it double posted.
    Last edited by TheEmptySet; June 16th 2008 at 10:00 PM. Reason: Double post
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  4. #4
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    thanks, i appreciate it
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