Those would be perpendicular bisectors.
If you do that to each side of the triangle they all meet at what is called the circumcenter.
http://mathworld.wolfram.com/Circumcircle.html
A bisector is a line (or line segment) which passes through the midpoint. You can have multiple lines intersect at this one point, and all of them will bisect the original line segment, since they pass through its midpoint. A perpendicular bisector passes through the midpoint, and also is perpendicular to the original line segment, so there will be only one of those.
The segment that passes through a vertex and is perpendicular to the opposite side is called the altitude of the triangle.
A midpoint is a point. It's the point exactly halfway between the endsof a line segment.A perpendicular bisector is a line. It's the line that passes through themidpoint of the segment, and is perpendicular to the segment.
A median of a triangle is a line or segment that passes through a vertex and the midpoint of the side opposite that vertex. The median only bisects the vertex angle from which it is drawn when it is an isosceles triangle.
Only one line of symmetry, it is the line that contains the median of the isosceles triangle (that passes through the vertex and perpendicular to the base).
a line that intersects an edge of a triangle that is perpendicular to it and passes through the midpoint
A line that is perpendicular to the segment of a plane and passes through the midpoint.
A perpendicular bisector.
A bisector is a line (or line segment) which passes through the midpoint. You can have multiple lines intersect at this one point, and all of them will bisect the original line segment, since they pass through its midpoint. A perpendicular bisector passes through the midpoint, and also is perpendicular to the original line segment, so there will be only one of those.
The segment that passes through a vertex and is perpendicular to the opposite side is called the altitude of the triangle.
and is perpendicular to the opposite side.
A midpoint is a point. It's the point exactly halfway between the endsof a line segment.A perpendicular bisector is a line. It's the line that passes through themidpoint of the segment, and is perpendicular to the segment.
Altitude.
perpendicular
side
A median of a triangle is a line or segment that passes through a vertex and the midpoint of the side opposite that vertex. The median only bisects the vertex angle from which it is drawn when it is an isosceles triangle.
Not necessarily. That only happens in isosceles and equilateral triangles.