Alden Tan's answer to Wesley's Secondary 3 E Maths Singapore question.
done
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Sine rule can also be used on the second part
Date Posted:
4 years ago
why is AF cos 41? why 41
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
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
why not cos 49
Is that to find (a)? If so then you can use it cos 49
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