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# Another maths question... watch

1. hi, so i got a to be 1.4 cm but somehow i cant find b? any ideaS?
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2. (Original post by User23)
hi, so i got a to be 1.4 cm but somehow i cant find b? any ideaS?
How you get 1.4 for a?
3. (Original post by S27)
What did you get for a?
you just quoted it
4. (Original post by S27)
How you get 1.4 for a?
so i found out the areas of the two right angled triangles so triangle 1 had an area of 12.5cm2 and triangle 2 had an area of 9cm2. so i minused the two areas to get the area of the triangle between them that contains the unknown height 'a'. then i did b x h /2. Knowing that the base is 5cm i did 5h=7, h gave me 1.4.
5. Use a similar logic for the triangle on the right. If you can the height of that triangle you can get b easily.

@user23 The right angle trinagle is 12.5cm2, and then use the area of the triangle you just found
6. (Original post by S27)
Use a similar logic for the triangle on the right. If you can the height of that triangle you can get b easily.

@user23 The right angle trinagle is 12.5cm2, and then use the area of the triangle you just found
so would b be 3.8 cm??
7. I found equations for the triangle with a right angle at the bottom left corner and the triangle with a right angle at the bottom right corner. Didn't get the same answer though :l.
8. (Original post by Craig1998)
I found equations for the triangle with a right angle at the bottom left corner and the triangle with a right angle at the bottom right corner. Didn't get the same answer though :l.
what did you get??
9. (Original post by User23)
so would b be 3.8 cm??
By using this logic I think so
10. (Original post by S27)
By using this logic I think so
ok thankss x
11. (Original post by User23)
hi, so i got a to be 1.4 cm but somehow i cant find b? any ideaS?
use pythagorus theory
12. (Original post by User23)
ok thankss x
Everyone is throwing me into doubt now :
13. (Original post by User23)
what did you get??
I got a as 5/3.
14. (Original post by Craig1998)
I got a as 5/3.
are you in year 12?
15. (Original post by User23)
are you in year 12?
Nope. Year 13.
16. (Original post by Craig1998)
Nope. Year 13.
Oh cool but you're 17 right...?
17. (Original post by User23)
Oh cool but you're 17 right...?
Mhm, I do maths, further maths and psychology at A2. What are you doing?
18. (Original post by Craig1998)
Mhm, I do maths, further maths and psychology at A2. What are you doing?
Well I'm in year 11 but I want to do maths, further maths, biology and chemistry. What did you drop?
19. (Original post by User23)
Well I'm in year 11 but I want to do maths, further maths, biology and chemistry. What did you drop?
Chemistry. I originally intended to just do psychology at AS, then continue with the three (more) academic subjects to A2. However, chemistry was absolutely awful after the first unit. Hence the weird choice of A2 subjects .
20. (Original post by Craig1998)
Chemistry. I originally intended to just do psychology at AS, then continue with the three (more) academic subjects to A2. However, chemistry was absolutely awful after the first unit. Hence the weird choice of A2 subjects .

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