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# Vector notation and definition question watch

1. I've got a notation question. The question is to find the area of a parallelogram with sides

I know that the area is given by , which can be derived by breaking the parallelogram into 2 triangles and using the formula for the area of a triangle.

I'd like to know if it is mathematically acceptable to write as a result of begin equal to .

If not, then does the double vertical line on either side of the matrix mean something else?

I also wanted to know the meaning of the term antiparallel. Does it mean that if is antiparallel to , then , where ?
2. Bump.
3. (Original post by Khallil)
I've got a notation question. The question is to find the area of a parallelogram with sides

I know that the area is given by , which can be derived by breaking the parallelogram into 2 triangles and using the formula for the area of a triangle.

I'd like to know if it is mathematically acceptable to write as a result of begin equal to .

If not, then does the double vertical line on either side of the matrix mean something else?

I also wanted to know the meaning of the term antiparallel. Does it mean that if is antiparallel to , then , where ?
Perhaps try maths stackexchange?
4. (Original post by keromedic)
Perhaps try maths stackexchange?
Will do!

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