The Student Room Group
Competition - post a photo you've taken of nature >>
Competition - post a photo you've taken of nature >>
Competition - post a photo you've taken of nature >>

Another maths question...

hi, so i got a to be 1.4 cm but somehow i cant find b? any ideaS?
yeah.PNG16.3KB

Scroll to see replies

Reply 1
Avatar for S27
S27
18
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?
Original post by S27
What did you get for a?

you just quoted it
Reply 3
Avatar for User23
User23
OP
3
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.
Reply 4
Avatar for S27
S27
18
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
(edited 8 years ago)
Reply 5
Avatar for User23
User23
OP
3
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??
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.
Reply 7
Avatar for User23
User23
OP
3
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??
Reply 8
Avatar for S27
S27
18
Original post by User23
so would b be 3.8 cm??


By using this logic I think so :smile:
Reply 9
Avatar for User23
User23
OP
3
Original post by S27
By using this logic I think so :smile:


ok thankss x
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
Reply 11
Avatar for S27
S27
18
Original post by User23
ok thankss x


Everyone is throwing me into doubt now :
:s-smilie:
Original post by User23
what did you get??


I got a as 5/3.
Reply 13
Avatar for User23
User23
OP
3
Original post by Craig1998
I got a as 5/3.


are you in year 12?
Original post by User23
are you in year 12?


Nope. Year 13.
Reply 15
Avatar for User23
User23
OP
3
Original post by Craig1998
Nope. Year 13.


Oh cool but you're 17 right...?
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?
Reply 17
Avatar for User23
User23
OP
3
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?
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 :biggrin:.
Reply 19
Avatar for User23
User23
OP
3
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 :biggrin:.


Wow, is chemistry that bad?

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you