All Junior Cert Technical Graphics posts
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    Ellipse need quick answer ronanmurray

    How do you draw an ellipse with only one axis and focal points?

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      Which axis do you have ?

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      can you answer both?

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      For the major:

      If you have a point and the minor draw lines verticle and horizontal from the point where the horizontal line touches the minor, draw a line from the centre through that point until it touches the vertical line from the point. This gives you the radius for the major axis

      For the minor:

      Get the point and draw lines horizontal and vertical from the point again. This time where the vertical line touches the minor, join it back to the centre of the circle. Where it crosses the horizontal line for the point, this gives you the radius for the minor circle

      Hope this helped

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