(1) |
An incentre is a point where the angle bisectors meet. |
(2) |
The median of any side of a triangle bisects the side at right
angle. |
(3) |
The point at which the three altitudes of a triangle meet is the
orthocentre |
(4) |
The point at which the three perpendicular bisectors meet is the
centre of the circumcircle. |