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The area of a triangle with vertices A, ...

The area of a triangle with vertices A, B, C is given by

A

`|vec(AB) xx vec(AC)|`

B

`(1)/(2)|vec(AB) xx vec(AC)|`

C

`(1)/(4)|vec(AC) xx vec(AB)|`

D

`(1)/(8)|vec(AC) xx vec(AB)|`

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