Question

what is the first theorem in circles

Answer 1

to prove that the angles which are maded at the centre from the circum frence are equal
hope it helps.....

Answer 2

The first theorem in circles is as follows:-
'In a circle Equal chords subtend equal angles at the centre'
Somewhere the first theorem may also be this:-
'The perpendicular from the centre of a circle to a chord bisects the chord. '
Thanks.