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# GCSE Maths Question Help

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1. I was doing a GCSE practice booklet but it had no mark scheme, I was wondering if someone could clarify if my answers are correct?

I got:

a) 253m
b) 046 (degrees)

Thanks!

2. (Original post by chrlhyms)
anyone?
You got the first one right but the second one, ϑ = 45.81, you normally round angle degrees to two decimal places unless it says otherwise, you got all the right working out it seems.
3. a)
BC^2 = 500^2 + 700^2 - 2 x 500 x 700 x Cos(15)
BC^2 = 250,000 +490,000 - 676148.0784
BC^2 = 63851.9216
BC = 252.6893777
BC = 253

b)
CosX = (252.68...^2 + 700^2 - 500^2) / (2 x 700 x 252.68...)
CosX = 303851.9216 / 353765.1288
X = Cos^-1 (0.8589086285)
X = 30.80573627
X + Y + 15 = 180
Y = 134.1942637
Y + Theta = 180
Theta = 45.80573627
Theta = 46

Both Correct - Well done! Good Luck with your Maths exam!
4. (Original post by 10tojones)
a)
BC^2 = 500^2 + 700^2 - 2 x 500 x 700 x Cos(15)
BC^2 = 250,000 +490,000 - 676148.0784
BC^2 = 63851.9216
BC = 252.6893777
BC = 253

b)
CosX = (252.68...^2 + 700^2 - 500^2) / (2 x 700 x 252.68...)
CosX = 303851.9216 / 353765.1288
X = Cos^-1 (0.8589086285)
X = 30.80573627
X + Y + 15 = 180
Y = 134.1942637
Y + Theta = 180
Theta = 45.80573627
Theta = 46

Both Correct - Well done! Good Luck with your Maths exam!
Thank you so much!!!! we had the same workings out too, ahhh thanks so much for your help! have a nice day :-)
5. (Original post by one_man_abdullah)
You got the first one right but the second one, ϑ = 45.81, you normally round angle degrees to two decimal places unless it says otherwise, you got all the right working out it seems.
oh i see, thank you!!!!!

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