How far is 2nd base to home plate using 70 foot bases?

This is a match problem which is easily solved with the match formula of a2 + b2 = c2.

65 ft2 + 65 ft2 = 8450 ft2

The square root of 8450 ft2 is 91.92 ft

So, 2nd base is 92.92 ft from the back of home plate on a field with 65 ft bases paths.