Assuming the distance of the earth from the moon to be 38,400 km and the angle subtended by the moon at the eye of a person on the earth to be 31, find the diameter of the moon.

Explanation

To find the diameter of the moon based on the given information, we can follow these steps:

### Step 1: Understand the Problem
We are given:
- Distance from the Earth to the Moon (r) = 38,400 km
- Angle subtended by the Moon at the observer's eye (θ) = 31 minutes

We need to find the diameter of the Moon (AB).
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