(A.P) A circle with area.......

Asked by  | 29th Jul, 2008, 12:30: AM

Expert Answer:

 the   radius of the larger circle = 3

 the area of the larger circle == 9   == A1 +A2 

                                                              A2  ==  9  -- A1  -----(1)

             A1 , A2 , A1 +A2  are in A.P   therefore  ( A1+ A1+A2 ) / 2  =  A2

                                                                                   2 A1 + A2  ==  2 A2

                                                                                          A2 = 2A1------(2)

 equating  (1) and (2) ,     9    -- A1 =  2A1

                                              3 A1  = 9

                                                A1  = 3

 therefore  the    radius  of the smaller circle =    3

 

 

Answered by  | 29th Jul, 2008, 05:47: PM

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