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a. Both Edina and Patsy are correct

b. They could have rounded off the distance and degree of elevation

c. They could have looked at the tree at different points.

d. Parallex error could have played a part in the different readings.

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a) Both Edina and Patsy are correct

b) The possibility of them having different answers could be because of a parallax error.

c) This could be avoided by them measuring the exact length of the tree

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Parallax error.

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They are correct because their answers are correct.
They might have parallax error.

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We think that both could be right as when we round it up to the nearest whole number, they are the same (26). However, we think that there are some parallax error due to the environment like haze and leaves. We can choose one point in the tree to look at.

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a) Both of them could be correct based on their measurements and our working.
25.6=26 when rounded off
26.1=26 when rounded off

b) Some possible errors would be that they made assumptions that the tree is exactly 90 degrees, parallax error, different eye levels, angle, perspective.

c) The error could be avoided if they had better instructions

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a) Both Edina and Patsy are correct based on their calculation (measurements).

b) Both of then did not consider their height and parallax error may happen.

c)They could have measured the actual height of the tree and compare them with their results.

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It is likely that patsy had rounded up the angle , causing it to be a different answer. (tan(42.49) would work).
Another possibility is that both patsy and Edina took the measurement from their height, and patsy is slightly shorter than Edina.
Another possibility could be due to the usage of different types of protractors, or a misreading of the angle.

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Rifky, Timothy, Youjia, Zhengxuan, Zahim

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Rifky, Timothy, Youjia, Zhengxuan, Zahim

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a) They are correct as their measurements are correct.
b) Parallax error may happen

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(a) Both parties could have their measurement correct because based on our working using TOA CAH SOH, both values are about the same.

(b) There is a possibility that they both made different assumptions such as where they measured the tree until and other factors such as the ground not being horizontal. (Parallax Error)

(c) The errors could be prevented if both of them discussed the different possible factors that could affect their results (in terms of calculation)

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(work in pairs)
YOUR TASK
(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.