1.

If the angles of elevation of the top of a tower from three collinear points A,B and C, on a line leading to the foot of thetower, are 30^(@), 45^(@) and 60^(@) respectively, then theratio, AB : BC, is

Answer»

` SQRT3 : 1`
` sqrt3: sqrt2`
`1 : sqrt3`
` 2: 3`

Answer :A


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