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).
The dimensions of a major league baseball diamond are 90 feet from base to base. The distance from home plate to the pitchers mound is 60 feet and 6 inches.
the distance from the pitchers mound to home plate is 60 feet 6 inches.
I'm assuming you mean USA baseball. The distance between home plate and the pitcher's rubber (the center of the mound) is 60 feet 6 inches. The distance between each base around the diamond is 90 feet.
The pitchers mound
to see were their feet are