ButchA

I agree.... Do a search on the ol' "Pythagorean Theorum" and you'll see how this was discussed over and over.

Edit:
20 feet squared = 400
20 yards (60') squared = 3600

a2+b2=c2...... 4000

Square root of 4000 = 63.24555

Divide by 3 (63.24555 / 3) = 21.08185

Pythagorean Theorum: 20 yard ground = 20 yards. 20 yard in tree 20 feet up = 21.08 yards.

Butch A.