Cable CD is attached to the 10-m mast ABC as shown. The base A of the mast is supported by a ball-and-socket joint, and the mast is guyed by cables BE and BF. Knowing g that φ = 8° and that the tensions in cables BE and BF are 840 N and 450 N, respectively, determine
(a) The value θ,
(b) The tension in cable CD,
(c) The reaction at A.

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14 m