Answer the following questions.
The eyeball is approximately spherical in shape. What is the diameter of a norinal human eye ball?

Explanation

To answer the question regarding the diameter of a normal human eyeball, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Shape of the Eyeball**: The question states that the eyeball is approximately spherical in shape. This means we can treat it as a sphere for the purpose of measuring its diameter.

2. **Identifying the Average Diameter**: The average diameter of a normal human eyeball is a factual piece of information. Based on common knowledge and scientific literature, the diameter of a normal human eyeball is approximately 2.3 cm.

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