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  1. #1
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    Default Autocad 2012 student question

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    I need to find the center of a circle that is tangent to another circle and a point on a line. I cannot use tangent tangent radius, Any suggestions.

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    can you post the file, so i can take a look at it?
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    The circle that is complete has a radious of 108. I need a circle with a radious of 102 that is tangent to that circle and tangent to a point 54 mm to the right of the start of the rectangle.
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    does the circle with the radius of 102mm need to be 54mm tot he right of this point of the rectangle?

    start rectangle.jpg
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    Quote Originally Posted by metsj373 View Post
    I need to find the center of a circle that is tangent to another circle and a point on a line. I cannot use tangent tangent radius, Any suggestions.
    Usually you need to do a bit of temporary construction to find the centre.

    Offset the circle by the new radius, so that you know that the centre of the new circle will lie somewhere on this offset line. Then draw a circle, centred on the line point, with a radius of your new circle, and where the two intersect is the proper centre of the new circle.

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