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# C4 vectors help Watch

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

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