AB & CD are two equal chords of a circle with centre O which intersect each other at the right angle at point P. If the perpendiculars from the centre to AB and CD meet them at M and N respectively, then MONP is a_______.
square.
Two equal chords in a circle are equidistant from the centre. Therefore OM=ON.
Also, OM=PN & ON= MP (geometry).
ON = PN = MP = MO
Moreover all angles are 900 . Therefore the figure OMNP forms a square as for a square all sides are equal and angles are 900 .