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secondary 3 | E Maths
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Wesley
Wesley

secondary 3 chevron_right E Maths chevron_right Singapore

help plss

Date Posted: 1 month ago
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Alden Tan
Alden Tan's answer
7 answers (Tutor Details)
1st
Sine rule can also be used on the second part
Wesley
Wesley
1 month ago
why is AF cos 41? why 41
Alden Tan
Alden Tan
1 month ago
Look at the triangle TAF, we realise that AF is the adjecent and TA=56 is the hypotenuse. Thus we use cos41= AF/TA
Thus AF=TA(cos41)=56cos41

It is 41 because we have established in part a that angle TAF is 41 degrees which is equal to the angle of depression
Wesley
Wesley
1 month ago
why not cos 49
Alden Tan
Alden Tan
1 month ago
Is that to find (a)? If so then you can use it cos 49