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Both of them are wrong. They forget to add their height to the height of the tree. Not adding their height to the tree. They should add their height to the height of the tree.

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a) they both could be correct
b)parallax/human error
c)they could take multiple readings

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a) Both could be correct or wrong
b) Parallax or Human error
c)Take multiple readings, use tools to have the precise measurement.

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a) Their method is correct however their measurements are not precise and thus both of them can be either right or wrong
b) Human error
c) Use more precise meausuring tools

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My Working.

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a) Both of them are wrong even though their method to find the height of the tree is correct
b) They might not have started at the same point of the eye, the line of vision does not start at the same point of the eye
c) Measure the line of vision from the same point of the eye

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A) Both of them can be correct but the method they used is correct.
B) The angles and lengths could be calculated wrongly causing the height of the tree to be measured wrongly.
C) Use machines instead of humans as machines are more accurate in calculations.

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a) Both of them may be correct
b) Measurement error. Rounding off could be inaccurate.
c) They should have measured the angle of elevation at the same distance away from the tree. From the bottom to the top of the tree.

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(a) Both are correct
(b) Parallax error, un-precise measurements, human error (different height level?)
(c) Re-measure the height of the tree several times, or use a digital laser to measure the actual height of the tree.

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(a) Both Edina and Patsy could be correct.
(b) They might've rounded off the angle of elevation, parallax error, eye level, etc.
(c) Use one person to measure from the two different distance, or they could measure the exact height of the tree to see who is right or wrong

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(a) If the level of accuracy is to 2 s.f. , both are correct. If the level of accuracy is to 3 s.f. , only Edina is correct.

Edina - Tan ( 25.6 / 20 = 52
Patsy - Tan ( 26.2 / 28 = 43

(b) There might be parallax error or they both saw treetop as of different points.There might be an error in taking in the measurements of their distance and angle.

(c) The measurement could have been taken several times or taken from the same distance around the diameter of the tree

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a) Both Edina and Patsy is correct in terms of method and calculation used.
b) Parallax Error
c) Use a digital program with a camera to measure the angle of elevation

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(a) justification on who is correct and why and who is wrong and why
(b) identify the nature of errors
(c) suggest how the errors could be prevented or reduced.