question about distances in a dressage arena

[nfpony]

I'm currently writing my novice freestyle to music dressage floorplan, i've never done this before and I've got myself all in a muddle I need 20m of medium walk, but i can't figure out how far 20m is. I just can't get my head round the measurements. I might be being thick but how many meters is across the diagonal from H-F or S-P? And E-B?

May be a silly question but I've never been good at maths and calculations!

 

[star]

E to B is 20m. For the others you need to work out the long side of a triangle using pythagorus! A squared plus b squared equals c squared. I can do it later if no one gets you the answer sooner!

 

[vallin]

H - F is 52m
S - P is 31.25m
E - B is 20m

 

[Britestar]

Any diagonal change will be more than 20m. Half a 20m circle will also be more than 20m in distance travelled.

 

[nfpony]

Thank you everyone!! Thats really helped - Im just awful at any sort of calculations aha!