Aqa maths unit 3 gcse - friday 14th june 2013

Original post by qwerty97

I got 0.8m for the length of h triangle

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Yeah, I got something like 0.82 :smile:

Then I doubled it for the H height... :/

Reply 61

Original post by DeuteriumPie

Although 44.7 is correct, you have rounded during an intermediate stage of you workings. That being the value of 1998.28. Instead, you could have just taken the root of (20^2)+(30^2)-2x20x30cos(125), got 44.59(...), and rounded to get 40.6. I'm guessing you'll still get all the marks because, according to markschemes, there is range in which answers can be correct due to rounding and the like :smile:

I'm pretty sure it said to round

Reply 62

DeuteriumPie

12

Original post by Hart37

I thought an A* would be 72, 90 0/0

It was for March 2013...

Reply 63

Midnight1811

3

Original post by qwerty97

I got 0.8m for the length of h triangle

This was posted from The Student Room's iPhone/iPad App

yayyy, did you use the tan function is trig ?

Reply 64

Original post by cucaracha

Yeah, I got something like 0.82 :smile:

Then I doubled it for the H height... :/

I got split the middle shape into a square at the bottom (1.2m) and then a triangle at the top, then used tan to working out the length of the tringle then added them together. can't even remember what i got

Reply 65

DeuteriumPie

12

Original post by emilialucy

I'm pretty sure it said to round

I can't remember if it asked you to round - in fact, I don't think it did. Anyhow, that's not the point. I'm just saying that you should never round during intermediate stages, so you can preserve the accuracy of the then-obtained answer. That's all I'm saying...

Reply 66

qwerty97

Yeah I used tan :smile:

and then got 1.6 for the H bit for the bigger length :smile:

This was posted from The Student Room's iPhone/iPad App

Reply 67

Original post by emilialucy

I got split the middle shape into a square at the bottom (1.2m) and then a triangle at the top, then used tan to working out the length of the tringle then added them together. can't even remember what i got

aghh, I split it into a square and triangle and didn't know how to move forward :mad:

How did you describe the rotation? I put 270degrees anticlockwise about the origin...

Reply 68

Original post by DeuteriumPie

I can't remember if it asked you to round - in fact, I don't think it did. Anyhow, that's not the point. I'm just saying that you should never round during intermediate stages, so you can preserve the accuracy of the then-obtained answer. That's all I'm saying...

Yeah thats true, but if you look at the mark scheme the answers generally aren't specific. And this was put as an example, in the test I did carry it through :smile:

Reply 69

Original post by cucaracha

aghh, I split it into a square and triangle and didn't know how to move forward :mad:

How did you describe the rotation? I put 270degrees anticlockwise about the origin...

90 Degrees clockwise around the origin (0,0)

Reply 70

Original post by emilialucy

90 Degrees clockwise around the origin (0,0)

that's the same as 270 anti, right?

Reply 71

Hart37

Does anyone remember the second part of the trapezium vector question? I just guessed the top was double the bottom

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Reply 72