The Student Room Group

How do you do this question?

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Reply 1
Original post by NavyBlitz
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Can you try uploading again as I'm getting attachment not found.
Also, what have you tried / what part are you stuck with?
Reply 2
Original post by mqb2766
Can you try uploading again as I'm getting attachment not found.
Also, what have you tried / what part are you stuck with?


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Reply 3
Original post by NavyBlitz
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Several ways to approach this - I would start by using a formula for area in terms of 2 sides and the sine of an angle to work out one of the angles and then proceed from there.
Reply 4
Original post by davros
Several ways to approach this - I would start by using a formula for area in terms of 2 sides and the sine of an angle to work out one of the angles and then proceed from there.


So you would use 1/2ABSinC but how would you work out the angle..?
Reply 5
Original post by NavyBlitz
So you would use 1/2ABSinC but how would you work out the angle..?

That will give you one of the angles - then you can use another standard triangle formula to deduce other angles as necessary.

I don't think the question can be answered in one step unless I've missed something :smile:
Reply 6
Original post by davros
That will give you one of the angles - then you can use another standard triangle formula to deduce other angles as necessary.

I don't think the question can be answered in one step unless I've missed something :smile:


So you would do 18 = 1/2(7)(8)SinC
To work out SinC?
Reply 7
Original post by NavyBlitz
So you would do 18 = 1/2(7)(8)SinC
To work out SinC?

Yes. Except in your diagram it's sin(B).
(edited 3 years ago)

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