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A point P is 3units away from line L1= ...

A point P is 3units away from line `L_1= 3x + 4y +5=0 and 4` units away from the line `L_2 = 8x-by +9=0`, The reflection of P on `L_1`, is `P_1` the reflection of `P_1` on `L_2`, is `P_2` the reflection of `P_3`, on `L_2`, is `P_4`, Then the area (in sq. units) of figure formed by joining `P_1P_2P_3, and P_4`, is-

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