The angle of elevation of the top of the...

The angle of elevation of the top of the tower observed from each of three points A,B , C on the ground, forming a triangle is the same angle `alpha.` If R is the circum-radius of the triangle ABC, then find the height of the tower R `tan alpha. `

`R sin alpha `

`R cos alpha `

`R cot alpha `

`R tan alpha `

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