What are the radius and diameter of a MEDEVAC ring?

• A. Radius 40 NM, Diameter 80 NM
• B. Radius 20 NM, Diameter 40 NM
• C. Radius 60 NM, Diameter 120 NM
• D. Radius 50 NM, Diameter 100 NM

Answer: (A)

Radius is half of a circle’s diameter, so the diameter is twice the radius. If the MEDEVAC ring has a radius of 40 nautical miles, its diameter is 80 nautical miles. This sizing defines the planning envelope around the pickup or casualty area, helping pilots know the space available for approach from any direction. The other options would correspond to different radii and thus different diameters, but the standard pairing here is 40 NM for the radius and 80 NM for the diameter.