For "O" level E. Maths students to
take note,
A recent trend is to identify the
centre of a circle.
The centre of a circle can
be
(a) the intersection
point of 2 perpendicular bisectors
(b) the mid point of
the hypothenuse of a right-angled triangle
(angle in a
semi circle)
(c) the vertex of
larger angle which is twice the vertex of the smaller angle
of
2
triangles sharing the same base.
(angle at
the centre is twice the angle at the circumference)