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Metra
i believe it should be 4.8
ClarenceV
The answer is 8.4.

I would use the Pythagorean Theorem to solve this:
  l² + l² = h²
  r² + (5)² = (9.8)²
  r² + 25 = 96.04
  r² = 96.04 - 25
  √r² = √71.04
  r = 8.428523...
  r = 8.4

Hope that helps.