Trig/cosine/sine rule etc, Mathematics

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#questiThe elevation of a telecommunication mast from two points, one due North of the tower and the other South of it are 21.2 degrees and 24.3 degrees respectively, and the two points are 300.000 meters apart.

i) explain how the accuracy of the final answer can be determined and justified.

ii) Find the height of the telecommunication mast to the greatest justifiable accuracy.

iii)How could the justifiable height of the telecommunication mast have been increased?on..

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