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all of it .. If C was the bottom of mast at 90 deg to theodolite. If D was top of mast ...Then Triangle ACD ...AC=CD/tan27.6 Triangle BCD .. BC=CD/Tan26 Using Pythag Theory and replacing values .. BCsquare= 200square +AC square so .... CD/Tan 26 Square = 210 square + CD/tan27.6...

In order to find the height of a inaccessible tower , a theodolite was set up at point A, due south of the tower , where the angle of elevation was measured at 27.32 degrees. The theodolite was moved to point B, 210 Metre's due east of A, where the angle of elevation was measured at 26 degrees...