The Student Room Group
Uni students - Complete our survey >>
Uni students - Complete our survey >>
Uni students - Complete our survey >>

3D Trig

Can someone help me with question 17c on the specimen calculator paper. I can't seem to visualise which angle I am supposed to work out :tongue:
Thanks in advance

http://www.mrbartonmaths.com/resources/GCSE%20Revision/Further%20Maths%20Past%20Papers/4.%20Specimen/Specimen%20Paper%20and%20Mark%20Scheme.PDF
Reply 1
Avatar for lerjj
lerjj
13
Original post by Super199
Can someone help me with question 17c on the specimen calculator paper. I can't seem to visualise which angle I am supposed to work out :tongue:
Thanks in advance

http://www.mrbartonmaths.com/resources/GCSE%20Revision/Further%20Maths%20Past%20Papers/4.%20Specimen/Specimen%20Paper%20and%20Mark%20Scheme.PDF


The two planes are the base and one of the sides of the pyramid.

Specifically, I'd make a midpoint M between B and C, then you are looking for angle VMX
(edited 9 years ago)
Reply 2
Avatar for Super199
Super199
OP
20
Original post by lerjj
The two planes are the base and one of the sides of the pyramid.

Mm can you send a picture of the bit I am looking at? Is it x to midpoint of BC and V to Midpoint BC? Is that the triangle? :s-smilie:
Reply 3
Avatar for lerjj
lerjj
13
Original post by Super199
Mm can you send a picture of the bit I am looking at? Is it x to midpoint of BC and V to Midpoint BC? Is that the triangle? :s-smilie:


Yep. There are some other triangles you can do it with and get the right answer, but that's the easiest one to do it with because you've already got two sides (and a right angle).

I'll try and do a picture, but I'm not 100% how to.
Reply 4
Avatar for lerjj
lerjj
13
pyramid.gif29.5KB
Reply 5
Avatar for Super199
Super199
OP
20
Original post by lerjj
...

ah I see cheers. I need help with 19c on this one as well if you don't mind. I have the same problem :tongue:
http://filestore.aqa.org.uk/subjects/AQA-8360-2-QP-JUN13.PDF
Reply 6
Avatar for lerjj
lerjj
13
Original post by Super199
ah I see cheers. I need help with 19c on this one as well if you don't mind. I have the same problem :tongue:
http://filestore.aqa.org.uk/subjects/AQA-8360-2-QP-JUN13.PDF


I've done that paper but haven't got around to marking it yet.

I've worked it out as angle DNB, which I did as (180-CNB). I'll actually start marking my paper I guess then come back to you.
Reply 7
Avatar for lerjj
lerjj
13


The yellow rectangle is the plane CDHG, the blue triangle is the plane MNB. The obtuse angle between them is the green angle marked on the left side.
Cuboid.gif27.6KB
Reply 8
Avatar for Super199
Super199
OP
20
Original post by lerjj
..

Ah thank you!!! Good luck tomorrow :smile:
Reply 9
Avatar for lerjj
lerjj
13
Original post by Super199
Ah thank you!!! Good luck tomorrow :smile:


No problem, you too!

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you