If BM and CN are the perpendiculars drawn on the sides AC and BC of the `Delta ABC`, prove that the points B, C, M and N are concyclic.

Explanation

To prove that points B, C, M, and N are concyclic, we will follow these steps:

### Step 1: Draw Triangle ABC
We start by drawing triangle ABC with points A, B, and C.

### Step 2: Draw Perpendiculars BM and CN
Next, we draw the perpendiculars BM and CN from points B and C to the sides AC and BC, respectively. Let M be the foot of the perpendicular from B to AC, and N be the foot of the perpendicular from C to BC.

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