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What is the true-anomaly-averaged radius when perigee and apogee radius for an elliptical orbit are 10,000 km and 4,000 km?

What is the true-anomaly-averaged radius when perigee and apogee radius for an elliptical orbit are 10,000 km and 4,000 km? Correct Answer 6324.56 km

Given, Perigee radius (rp) = 4,000 km Apogee radius (ra) = 10,000 km True-anomaly-averaged radius (rmean, θ) = (ra.rp)1/2 = (10,000*4,000)1/2 = 6324.56 km

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