ABCD is a rectangle in which diagonal BD bisects `angle B`. Show that ABCD is a square.

Explanation

To prove that rectangle ABCD is a square given that diagonal BD bisects angle B, we can follow these steps:

### Step 1: Draw the Rectangle
Draw rectangle ABCD with vertices A, B, C, and D such that AB is parallel to CD and AD is parallel to BC.

### Step 2: Identify Angles
Since ABCD is a rectangle, we know that:
- Angle A = Angle B = Angle C = Angle D = 90 degrees.
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