Assuming that you meant midpoint, it is a median.
midpoint
It is called the median.
Such a line is called a perpendicular bisector.
This point is called the midpoint.
Line segment RT
It is called the median.
A segment that joins a vertex of a triangle and the midpoint of the side opposite that vertex is called a median. The three medians are concurrent at the centroid (the point of their intersection, and it is two-thirds of the way down each median. For example, if the three medians AA', BB', and CC' of the triangle ABC, intersect at G, then AG = 2GA', BG = 2BG', and CG = 2CG')
The middle of a line segment is called a Midpoint.;-)
The segment that passes through a vertex and is perpendicular to the opposite side is called the altitude of the triangle.
It is called a bisector.
perpendicular bisector
This line is called the bisector (German Halbierende, Dutch bissectrice, Swedish bisektris).In an isosceles triangle the bisector of the side opposite the unequal angle is also perpendicular to that side.In an equilateral triangle all bisectors are perpendicular to the opposite sides.The point in which all bisectors meet in a triangle is called its barycenter (English from Greek meaning "center of gravity") and if the triangle were made of a homogeneous material of infinitesimal height (that is, if it were two-dimensional) it would be indeed its center of gravity.
The hypotenuse. It is used to measure height. Very simple equation.
the midpoint
It's called a perpendicular bisector of the line segment.
midpoint
A point on a segment that is halfway between the two endpoints is called the midpoint of the segment. It is the point that divides the segment into two equal parts.