What percentage of the sector OAB is occupied by the inner circle: 50%, 69%, 75% or 81%

Could someone please show me a way to find it out?

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- October 5th 2008, 09:17 PMxwrathbringerxArea
What percentage of the sector OAB is occupied by the inner circle: 50%, 69%, 75% or 81%

Could someone please show me a way to find it out? - October 5th 2008, 10:06 PMearboth