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Question
In the given figure, obtain all the points equidistant from lines m and n; and 2.5 cm from O.

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Solution
Draw an angle bisector PQ and XY of angles formed by the lines m and n.
From O, draw arcs with radius 2.5 cm, which intersect the angle bisectors at a, b, c and d respectively.
Hence, a, b, c and d are the required four points.
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