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Thread: Need help with calculations on an arc I'm drawing out for a project

  1. #1
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    Need help with calculations on an arc I'm drawing out for a project

    Need help with calculations on an arc I'm drawing out for a project-14897544398432133787419.jpg

    I'm in real need of some help I'm making a little project and need to plot an out an arc and don't have a giant protractor so can anyone tell me how to work out the height of line A or even give me the answer

    Many thanks
    David
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  2. #2
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    Re: Need help with calculations on an arc I'm drawing out for a project

    three graph screenshots attached ...
    Attached Thumbnails Attached Thumbnails Need help with calculations on an arc I'm drawing out for a project-arc2.png   Need help with calculations on an arc I'm drawing out for a project-arc1.png   Need help with calculations on an arc I'm drawing out for a project-arc3.png  
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    Re: Need help with calculations on an arc I'm drawing out for a project

    Hi skeeter thanks but can you explain this as a long time since iv that to do stuff like this (Nearly 20 years lol)
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    Re: Need help with calculations on an arc I'm drawing out for a project

    Quote Originally Posted by Nutcase1 View Post
    Hi skeeter thanks but can you explain this as a long time since iv that to do stuff like this (Nearly 20 years lol)
    You are basically looking for the equation of a parabola: $(x-h)^2=4a(y-k)$.
    $(h,k)$ is the vertex which is $(0,1220)$. We know that the point $(1830,~1530)$ is also on the curve.
    Given all that you should be able to work out $a=~?$ BTW $a>0$.
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  5. #5
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    Re: Need help with calculations on an arc I'm drawing out for a project

    I used a circular arc ...
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    Re: Need help with calculations on an arc I'm drawing out for a project

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