1.

If a tower subtends equal angles at four points P, Q , R and S that lie in a plane containing the foot of the tower , the which fo the following statements is always true (here, the tower is perpendicular to the plane containing the points P, Q,R,S)

Answer»

`anglePQS=anglePRS`
`anglePQR+anglePSR=180^@`
`anglePQS=90^@rArranglePRS=90^@`
`(PQ)(RS)+(PS)(RQ)=(PR)(QS)`

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