## Search found 4 matches

### Equations for finding points on a circle circumference

Hi

In this diagram, the points with a green dot are known and the red ones unknown. Could someone explain what formula I need to determine the red dotted points?

Thanks
on Thu Jul 18, 2013 8:45 pm

Forum: Trigonometry
Topic: Equations for finding points on a circle circumference
Replies: 3
Views: 997

### Re: Equations for finding points on a circle circumference

Hi Ahh, so the technique is to use pythagoras - I should have thought of that! I have extended the formula to deal with the fact that the origin (a,b) of my circles are not 0,0 so to get the y coord for my point C I am using: y = b +/- sqrt{r^2 - (L-K)^2} (where points on my circle diagram a...
on Fri Jul 19, 2013 12:35 pm

Forum: Trigonometry
Topic: Equations for finding points on a circle circumference
Replies: 3
Views: 997

### Circles and triangulating points on the circumference

Hi I am trying to programatically draw a circle with a diamond hatch pattern in it. To do so I need to work out the x/y coords that each line intersects the circle. I know the x/y coords of the circle origin, the radius of the circle and the width and height of each diamond (the height being general...
on Tue Aug 13, 2013 4:52 pm

Forum: Trigonometry
Topic: Circles and triangulating points on the circumference
Replies: 2
Views: 1059

### Re: Circles and triangulating points on the circumference

Yes, that is largely correct. The lines represent lead strips on the glass of a circular window so it is preferable to draw them in the way they physically exist. However, if it is not possible (or fiendishly complicated) to calculate them in that way then I am open to any other suggestions.
on Wed Aug 14, 2013 12:59 pm

Forum: Trigonometry
Topic: Circles and triangulating points on the circumference
Replies: 2
Views: 1059