# Thread: Problem with practice exercise

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Thanks SLW210, this looks closest to the Exercise drawing. Can you please tell us how you did it?

2. Yes I can place the R5 in very many positions.

3. When you get back to class ask the instructor how he/she would do the same exercise.

4. I also think that the R5 and R10 circles are not positioned. I would say that these two circles are tangential at the Ortho points, i.e. the centres of the two circles lie on a vertical line.

Therefore to draw them, I would offset the R3 circle by 10, and offset the left hand vertical line A by 5. Where these intersect at X (the upper intersection point) is the centre of the R10 circle and hence the R5 circle can be drawn.

5. I would say that these two circles are tangential at the Ortho points, i.e. the centres of the two circles lie on a vertical line.
Thanks eldon, this looks to be a reasonable assumption, looking at the exercise drawing, and with the lack of any more definitive information for the centre points of R5 and R10 circles.

I like the way you have drawn the two loci ( the red straight line and the red circle) of the R10 circle to determine the centre point.

And your end result looks very much like the exercise drawing.

Many thanks to all that helped with this problem, I have learnt lots.

6. My \$0.05 Like every one else need a angle of common TP or a length on left side. Its poor workmanship when these examples are missing a vital piece of information.

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Sometimes, geometry is not compatible with tidy dimensions

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