## Ellipses' properties and areas of polygons and circles

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Moderator: andrew

andre anckaert
Newbie Member
Posts: 4
Joined: Wed Feb 24, 2010 4:55 pm

### Ellipses' properties and areas of polygons and circles

Here is a link to an image showing an ellips and its properties:

http://fotoalbum.seniorennet.be/seniora ... to=1305678

The values of the "Major Point" (which one is that?) are confusing me. The X-value is, as far as I can see, simply the |distance| between the centre point and the endpoint of the smaller radius. I cannot figure out what Y=-37.27 stands for or means. I hope somebody will care to explain that to me, please?

I see this in relation to calculating the area of circles, ellipses and polygons. I found how to find the latter in the Help. But for circles, ellipses, and mixtures of (parts of) these I am afraid we shall have to do some own arithmics??

I dream of finding some means of selecting any contour and see Qcad tell me the area of it. Would that be an illusion?

andrew