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eh... if anyone is interested in the solution, here it is:

It's really simple actually... Because it is a CIRCLE, 2-dimensional shape, the scalar triple products are all equal to zero...

Three vectors in a 2D plane are always linearly dependent.

I'm going to check out your links, thanks ganesh.

**NoSash**- Replies: 5

See the image, show using the diagram...

I have no idea how to apply the diagram.

**NoSash**- Replies: 1

How can I prove the associative law (multiplication) using vectors:

m(na) = (mn)a where m and n are real numbers, and a is a vector?

There are three cases to prove:

m>0, n>0

m<0, n<0

m>0, n<0 and m<0, n>0

I have no idea where to start.

yeah it all makes sense, thanks guys

**NoSash**- Replies: 7

1) 16 - 36 = 25 - 45

2) 16 - 36 + 81/4 = 25 - 45 + 81/4

3) 4^2 - 2x4x9/2 + (9/2)^2 = 5^2 - 2x5x9/2 + (9/2)^2

4) (4 - 9/2)^2 = (5 - 9/2)^2

5) 4 - 9/2 = 5 - 9/2

6) 4 = 5

What went wrong?

I'm pretty sure the error is from step 3 to 4 but I don't know what the heck they are trying to do.

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