If you draw a circle out and divide it into eighths or fourths, you can see that 2/8 equals 1/4.
Or you could just do equivalent fractions and since the denominator 4, you have to multiply that by 2 to get the denominator of 8 so you have to do the same with the numerators. 1 times 2 equals 2 so 1/4=2/8
Is this confusing i hope it isn't Hope this helps!
If the bases are 120ft apart from each other you would have to find the distance of going from first to second then to third. Then you divide it in half because you arent going around the diamond, you are cutting right through it.