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secondary 3 | E Maths

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Students are told to find the height of a building by measuring the angle of elevation from the ground to the top of the cross using a Clinometer. They are told to take 3 different readings of the angle and calculate of the height of each reading. Question 4 is asking why there may be different heights for each reading. Will need help for question 1 and 2 too.

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Not sure if my answer is in syllabus as these are cheap modern tech that you can find.