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QuestionHealthcare

The average hairline circumference of an adult human head is: Select one: A. 18" (45.7 cm) B. 20" (50.8 cm) C. 22" (55.8 cm) D. 24" (60.9 cm)
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Answer

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Step 1:
I'll solve this problem step by step:

Step 2:
: Understand the Question

The problem asks about the average hairline circumference of an adult human head. This requires knowledge of typical human head measurements.

Step 3:
: Consider Anthropometric Data

Based on standard anthropometric measurements, the average adult human head circumference typically falls within a specific range. Medical and design references consistently show this measurement.

Step 4:
: Analyze the Given Options

Let's review the options: A. 18" (45.7 cm) B. 20" (50.8 cm) C. 22" (55.8 cm) D. 24" (60.9 cm)

Step 5:
: Determine the Correct Measurement

The most accurate average adult head circumference is 22 inches (55.8 cm). This measurement is widely accepted in medical and design fields for: - Hat sizing - Headwear design - Medical anthropometry - Ergonomic studies

Step 6:
: Verify the Measurement

Multiple sources, including anthropometric databases and medical references, confirm that 22 inches represents the average adult head circumference.

Final Answer

C. 22" (55.8 cm)