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30 Aug 2009, 15:33
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see figure..
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30 Aug 2009, 16:03
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For the chord to be equal to 2, the central angle (that forms that chord) must be equal 60 degrees. Since point B can be placed either to the right or the left of point A, you can place point B anywhere on the arc formed by the central angle of 120 degrees (60 degrees to the right from A and 60 degrees to the left from A), in order to form chord AB=<2.
P(chord<=2)=120/360=1/3
P(chord>2)=1-P(chord<=2)=2/3
P(chord<=2)=120/360=1/3
P(chord>2)=1-P(chord<=2)=2/3
31 Aug 2009, 05:51
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I did not get..why are we considering 2 parts out of 6 parts for radius<=2. The circle is divided into 6 parts and the chord should lie in only 1 part to be <=2. If we take angle as 120 then the length of chord will be >2 !!
