1.

The tangents of the angles subtended by a tower at four points A, B, C and D on the ground are in H.P. If O be the foot of the tower on the ground, then

Answer»

OA + OC = OB + OD
OA + OB = OC + OD
OA + OD = OB + OC
AB + CD = BC + CD

Answer :C


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