You are Here: Home >< Maths

# C4 vectors help

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016
1. https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf

question 14e

I dont know where to start from for this question
2. (Original post by imran_)
https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf

question 14e

I dont know where to start from for this question
Sketch.
3. (Original post by Zacken)
Sketch.
Lol, I did still don't know how to approach this question
4. Give us the answers the the previous parts
5. (Original post by imran_)
https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf

question 14e

I dont know where to start from for this question
As said, draw a diagram! This is definitely the best method for solving vectors questions!

Without doing the prior parts of the question, I assume you will need to use the area of a triangle in vector form is given by ||a x b||/2 (the cross product of two sides of the triangles). You can find CA and CB in CAD and CAB since you know A, B and C. Then you just take D as a generic point on the line, so it will involve the parameter lambda, then take the vectors for the sides and plug them into the cross product formula for the area of a triangle. Then you can use the fact that the areas are related!

Hope this helps

## 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 7, 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

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

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