# 3D Trig

Watch
Announcements
#1
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

http://www.mrbartonmaths.com/resourc...k%20Scheme.PDF
0
6 years ago
#2
(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

http://www.mrbartonmaths.com/resourc...k%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
0
#3
(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?
0
6 years ago
#4
(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?
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.
0
6 years ago
#5
1
#6
(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
http://filestore.aqa.org.uk/subjects...2-QP-JUN13.PDF
0
6 years ago
#7
(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
http://filestore.aqa.org.uk/subjects...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.
0
6 years ago
#8

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.
0
#9
(Original post by lerjj)
..
Ah thank you!!! Good luck tomorrow
0
6 years ago
#10
(Original post by Super199)
Ah thank you!!! Good luck tomorrow
No problem, you too!
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Current uni students - are you thinking of dropping out of university?

Yes, I'm seriously considering dropping out (99)
13.49%
I'm not sure (32)
4.36%
No, I'm going to stick it out for now (230)
31.34%
I have already dropped out (17)
2.32%
I'm not a current university student (356)
48.5%