You are Here: Home >< Maths

# Area of a triangle vectors

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. Hi, For questions 8(iv) how can i draw a diagram to help me find the area, im struggling to visualize it.thanks

https://5c59854d0ccd29d489c9e5e689a8...20C4%20OCR.pdf
2. (Original post by SamuelN98)
Hi, For questions 8(iv) how can i draw a diagram to help me find the area, im struggling to visualize it.thanks

https://5c59854d0ccd29d489c9e5e689a8...20C4%20OCR.pdf
When you have a 3D shape, one method is to draw the projection onto 2D. So for the sake of the diagram, ignore the z-coordinate and just draw the diagram as if it didn't exist.

On rare occasions, where the z-coordinate is the same for two points, and it might get confusing, ignore one of the other coordinates instead and just plot x,z or y,z.
3. just use 1/2 ab sin C
where a = magnitude(OA)
b = magnitude(OB)
and C is the angle between them (use scalar product OA.OB)

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: June 4, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams