The line drawn between the bases on the Baseball field is known as the baseball diamond. This area is also known as the infield.
The lines that are drawn in white from home to 1st and home to 3rd, and in both cases all the way past the two bases to the outfield walls, are called the foul lines. There is no line drawn on the field from 1st to 2nd, nor 2nd to 3rd.
The line is called a diagonal if it is drawn between two nonadjacent angles.
Diameter
a straight line
The midcourt line in basketball exactly divides the basketball court into two equal sections. In the NBA the line is47 feet from each end line.
Baseline
A separator or a horizontal line.
It is called a bisector.
The commitment line is drawn perpendicular to the third base line 20 feet from the point of home plate.
This is called the diameter of the line that passes through the center of the circle. Half of that line is called the radius.
It's called a radius
A segment.