The measured distance from the nasion to the inion is 32cm. What is the distance from the inion to Oz?

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Multiple Choice

The measured distance from the nasion to the inion is 32cm. What is the distance from the inion to Oz?

Explanation:
On the 10-20 system, positions along the nasion–inion line are set by percentages of that distance. Oz is located near the back of the head on the midline, about 10% of the distance from the Inion toward the Nasion. With a nasion–inion distance of 32 cm, the segment from Inion to Oz is 10% of that distance: 0.10 × 32 cm = 3.2 cm. Therefore, the distance from Inion to Oz is 3.2 cm.

On the 10-20 system, positions along the nasion–inion line are set by percentages of that distance. Oz is located near the back of the head on the midline, about 10% of the distance from the Inion toward the Nasion. With a nasion–inion distance of 32 cm, the segment from Inion to Oz is 10% of that distance: 0.10 × 32 cm = 3.2 cm. Therefore, the distance from Inion to Oz is 3.2 cm.

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