CBSE Class 9 Maths Circles
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If two intersecting chords PQ and RS of a circle make equal angles with the diameter passing through their point of intersection, then prove that the chords are equal.
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Prove that the angle in the minor segment is an obtuse angle.
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In the given figure, equal chords AB and CD of a circle C(O, r) cut at right angles at E. If M and N are the mid points of AB and CD respectively, prove that OMEN is a square.
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In the figure A, B and C are three points on a circle such that the angle subtended by the chords AB and AC at the centre are 120o and 80o respectively. Determine angle BAC.
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P is the centre of the circle. Prove that
XPZ is equal to twice the sum of XZY and YXZ. 
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O is the centre of the circle, find the value of x.
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AB and AC are two equal chords of a circle whose centre is O. If OD is perpendicular to AB and OE is perpendicular to AC, prove that
ADE is an isosceles triangle. 
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O is the centre of the circle and PQ is a diameter. If ROS is equal to 40o find RTQ.
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PQ and RQ are the two chords of a circle equidistant from the centre O. Prove that the diameter passing through Q bisects PQR and PSR.
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In the figure, O is the centre of a circle. Prove that x + y = z.
