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The angles A, B and C of a triangle ABC are in A.P. and a : b = 1 : 3 . If c = 4 cm, then the area (in sq. cm) of this triangle is :

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The angles A, B and C of a triangle ABC are in A.P. and a : b = 1 : 3 . If c = 4 cm, then the area (in sq. cm) of this triangle is :

(1)  2√3 (2) 4√3  (3)  4/√3  (4)  2/√3

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Correct option  (1)  2√3

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