The 40m Antenna AO is supported by three wires connected at A. The direction cosines of wire AD(measured from A) are -0.7807 along the y-axis, and -0.4879 along the z-axis. Points B,C,D, and O lie in the x-z plane. If the resultant of the three wires is 10KN vertically downward along AO, find: a) direction angle of a of AD(measured form A to D), b) all wires in Cartesian vector form, c) magnitudes of wires AB, AC, and AD, ) angle between AD and AC, e) coordinates of point C. For the numeric answer give the magnitude of force AB to no decimal place.

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