A ladder `15 m` long reaches a window which is 9m above the ground on one side of a street. Keeping its foot at the same point, the ladder is turned to other side of the street to reach a window 12m high. Find the width of the street.

Explanation

To solve the problem of finding the width of the street using the given information about the ladder and the heights of the windows, we will use the Pythagorean theorem. Here is the step-by-step solution:

### Step 1: Understand the Setup
We have a ladder of length 15 m. It reaches a window that is 9 m high on one side of the street and then is turned to reach a window that is 12 m high on the other side, with the foot of the ladder remaining at the same point.

### Step 2: Draw the Diagram
Let's label the points:
- Let point A be the foot of the ladder.
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