MEDIAN		HAS ONE OR MORE POINTS IN COMMON
CONCURRENT LINES		POINT OF CONCURRENCY OF LINES CONTAINING THE ALTITUDES OF A TRIANGLE
POINT OF CONCURRENCY		A LINE ,RAY, OR SEGMENT THAT IS PERPENDICULAR TO A SIDE OF A TRIANGLE AT THE MIDPOINT OF THE SIDE
ALTITUDE		THE DISTANCE AROUND A CIRCLE
PERPENDICULAR LINES		A BISECTOR OF AN ANGLE OF THE TRIANGLE
INCENTER		THE POINT OF CONCURRENCY OF THE ANGLE BISECTORS OF A TRIANGLE
INTERSECT		TWO LINES THAT INTERSECT
MIDSEGMENT		THREE OR MORE LINE THAT INTERSECT IN THE SAME POINT
MIDPOINT		A SEGMENT THAT CONNECTS THE MIDPOINT OF TWO SIDES OF A TRIANGLE
ORTHOCENTER		A RAY THAT DIVIDES AN ANGLE INTO TWO ADJACENT ANGLES THAT ARE CONRUENT
CENTROID		A SEGMENT WHOSE END POINTS ARE A VERTEX OF THE TRIANGLE AND THE MIDPOINT OF OPPOSITE SIDE
ANGLE BISECTOR IN A TRIANGLE		THE POINT OF INTERSECTION OF CONCURRENT LINES
ANGLE BISECTOR		THE POINT THAT DIVIDES OR BISECTS A SEGMENT INTO TWO CONGRUENT SEGMENT
PERPENDICULAR BISECTOR		PERPENDICULAR SEGMENT FORM A VERTEX OF A TRIANGLE TO THE OPPOSITE OR TO THE LINE THAT CONTAINS THE OPPOSITE SIDE.
CIRCUMCENTER		POINT OF CONCURRENCY OF THE MEDIANS OF A TRIANGLE