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20 metres of wire is available for fencing off a flower-bed in the form of a circular sector of radius 5 metres,

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20 metres of wire is available for fencing off a flower-bed in the form of a circular sector of radius 5 metres, then .the maximum area (in sq. m.) of the flower-bed is

(A) 15 

(B) 20 

(C) 25 

(D) 30

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Correct option is : (C) 25

r + r + rθ = 20m 

2r + rθ = 20

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