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Question

In fig 4.44 chord AB = chord CD, seg AB seg CD. Points M and N are midpoints of chord AB and chord CD respectively prove that MONE is a square.

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Solution

Given : M and N are the mid points of AB and CD, respectively.We know that perpendicular from the centre on a chord divides the chord.So,OME = 90° and ONE = 90°MEN = 90° (given)Therefore, the fourth angle will also be 90°.As all the angles are 90°, MONE is a rectangle.And so its opposite sides are equal.OM = NE and ON= ME ---1Again, given : chord AB = chord CDWe know that equal chords are equidistant from the centre. OM = ON -----2From 1 and 2,we can say that all the sides of quadrilateral MONE are equal and we have already proved that all the angles are 90°.Therefore, quadrilateral MONE is a square.

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