A LINE JOINING THE MIDPOINTS OF TWO SIDES IF A TRIANGLE.

3 OR MORE LINES MEET AT THE SAME POINT.

THE POINT WHERE 3 PERPENDICULAR LINES MEET EACHOTHER

A LINE JOINING A VERTEX TO THE MIDPOINT OF THE OPPOSITE SIDE

A POINT WHERE 3 MEDIANS OF THE TRIANGLE INTERSECT

A LINE SEGMENT CONNECTING A VERTEX

A POINT WHERE 3 ALTITUDES OF A TRIANGLES INTERSENT

CONCURRENT

REAL WORLD EXAMPLE