Why is the pitchers mound not in the center of the baseball diamond?
This is because the rules of baseball say the mound is a
distance from homeplate that is less than halfway the distance
between homeplate and 2nd base.
The distance is the same between each base in order (the same
from home to 1st, 1st to 2nd, 2nd to 3rd, 3rd to home.) This
results in the distance between homeplate and 2nd equal to the
distance between 1st and 3rd.
If you draw a line between homeplate and 2nd, and a line between
1st and 3rd, the lines will intersect in the center of the baseball
diamond. However, the center point will be behind the pitcher's
mound.
You can use the Pythagorean Theorem to prove the distance from
the mound to home is less than the center point, but that is
another question. (Hint: The distance squared from home to first
plus the distance squared from first to second divided by 2).