15m circle at S and 20m circle at C

[hotdog]

does anyone have a diagram to show what the size of a 15m circle at S looks like and a 20m circle at C in a 60x20 area?

Everytime I do them I get them too large but then I only practice in a 40x20 arena, so thought it would help if I could see a diagram

 

[Evelynmary]

You could try dressagediagrams.org unless you have a Mac and don't run the right software. Alternatively make your own plan of the arena but don't make the mistake of thinking its divided equally between the letters down the long side.