Need help on this GCSE MATHS Cosine and Sine rule Question

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Simran_Kamble
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I googled Maths Cosine and Sine rule GCSE exam questions and some helpful person decided it was alright to upload the questions on pdf and not attach the answers with it.

I have done the first question, 18a and 18b, but I need some expert mathematician to tell me the answer so I can check it. I would be extra helpful if you could work out the rest of the answers for me so I can relate to them.

http://mathsanswers.org.uk/gcse/Topi..._Rule/PPQs.pdf

Thank you, x
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TenOfThem
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(Original post by Simran_Kamble)
I googled Maths Cosine and Sine rule GCSE exam questions and some helpful person decided it was alright to upload the questions on pdf and not attach the answers with it.

I have done the first question, 18a and 18b, but I need some expert mathematician to tell me the answer so I can check it. I would be extra helpful if you could work out the rest of the answers for me so I can relate to them.

http://mathsanswers.org.uk/gcse/Topi..._Rule/PPQs.pdf

Thank you, x
Please feel free to post your answers, someone will happily check them for you
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brianeverit
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(Original post by Simran_Kamble)
I googled Maths Cosine and Sine rule GCSE exam questions and some helpful person decided it was alright to upload the questions on pdf and not attach the answers with it.

I have done the first question, 18a and 18b, but I need some expert mathematician to tell me the answer so I can check it. I would be extra helpful if you could work out the rest of the answers for me so I can relate to them.

http://mathsanswers.org.uk/gcse/Topi..._Rule/PPQs.pdf

Thank you, x
18 (a) 28.9 sq.cm. (b) 9.40 cm.
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asl
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Hi Simran

I am the "helpful person" (well I hope so).

If you go to

http://mathsanswers.org.uk/gcse

and scroll right down, you will see that there is a link to the solutions to those questions (PPQAnswers.pdf). In fact the PPQs for all the topics on that page have answers.

But don't look at the solutions uintil you have tried the questions yourself. If you get stuck, you could try looking at the Notes, which try to explain when to use the Sine Rule and when to use the Cosine Rule.

Good luck!
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TutorTrish
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Whenever I teach this topic I always tell students to look for an angle and the side opposite to it as a pair. If you can find two of these pairs in the triangle then you are using Sine rule...otherwise the one pair means it's cosine rule (the pair you have being the a/A in the formula). You'll usually get the first mark awarded for the question for correct substitution into the relevant equation, then just take it steady in your rearranging/calculating.
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