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Extracted text: Considering the effects of curvature and refraction, the difference in elevation of points B and C is found to be 111.356 m. From point A in between B and C is the angle of elevation of B and C are 18°30' and 8015 respectively. a. If C is 2000 m from A, how far is B from A? b. If the elevation of A is equal to 200 m, find the elevation of B c. Find also the elevation of C