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Question 10
If BM and CN are the perpendiculars drawn on the sides AC and AB of the ΔABC, prove that the points B, C, M and N are concyclic.

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Solution

Given in ΔABC, BMAC and CNAB.
To prove that points B, C, M and N are concyclic.
Construction : Draw a circle passing through the points B, C, M and N.Proof
Suppose we consider BC as the diameter of the circle. Also, we know that BC subtends a 90 to the circle.
So, the points M and N should be on a circle.
Hence, BCMN from a concyclic quadrilateral.

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