- Perpendicular bisector of the side of a triangle
A line (ray or segment) which is perpendicular to a segment at its midpoint is called
the perpendicular bisector of that segment.
Note that the ray may not pass through vertex A. Paper folding techniques will be
useful to teach this concept.
- Circum center
The point of concurrence of the perpendicular bisectors of the sides of a triangle is
called as the circum center of the triangle and is normally denoted by the letter S.
Once the child is clear with the nature of perpendicular bisector, the idea of circumcenter
may be taught with the assistance of paper folding.
A
B D C
A
S
E
B D C
