# Find ce centre of an arc tangent to 2 cercles....

• posted
Hello
I draw a circle at 0,0 r=50
I draw another circle at 200,0 R=100
I want to draw an arc perfectly tangent to both circle (in such a way that,
when finished, the whole looks a little bit like an ellipse quarter)
How can I find EXACTLY the arc center position?
Thank you for help
°^O
O
(
°
• posted
Hint: The center on the unknown arc will be 350 from circle 1 and 300 from circle 2.
• posted
Why don't you just draw an cricle using the TTR option? Start circle and enter TTR. Pick the two circles and enter the radius. Then you can use the ID and cen commands to find the center of the circle, which hapopen to be 181.25,-299.4125,0.
• posted
I draw a circle at 0,0 r=50 I draw another circle at 200,0 R=100 I want to draw an arc perfectly tangent to both circle (in such a way that, when finished, the whole looks a little bit like an ellipse quarter) arc radius is 400 How can I find EXACTLY the arc center position
• posted
There are actually many circles which are tangent to 2 others, simulating an ellipse; the reason being you can choose tangent points in a more or less large section of the circles depending on how far away you are from the circles. You will need to determine this variable.
If both circles on each side are equal, your "ellipse" center will be on a perpendicular to the middle point of the circles. The missing point lies somewhere along this perpendicular.
Hope this helps.
Dr Fléau
"R Wink" a écrit dans le message de news: snipped-for-privacy@4ax.com...

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.