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Area of a triangle vectors

Hi, For questions 8(iv) how can i draw a diagram to help me find the area, im struggling to visualize it.thanks

https://5c59854d0ccd29d489c9e5e689a8bbadf49aa0f0.googledrive.com/host/0B1ZiqBksUHNYREhxMHhfam1IQm8/for-OCR/Solomon%20K%20QP%20-%20C4%20OCR.pdf
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://5c59854d0ccd29d489c9e5e689a8bbadf49aa0f0.googledrive.com/host/0B1ZiqBksUHNYREhxMHhfam1IQm8/for-OCR/Solomon%20K%20QP%20-%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.
(edited 7 years ago)
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Avatar for MathsSir
MathsSir
1
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)

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