Posted by **Krista** on Sunday, April 7, 2013 at 6:12pm.

The question asks me to find the area of the triangle with the given vertices. (The area A of the triangle having u and v as adjacent sides is given by A=1/2 ||u x v||.)

the vertices are:

(0,0,0) (1,2,3) (-3,0,0)

- Vectors/Calculus -
**Steve**, Sunday, April 7, 2013 at 6:16pm
so, call the 3 points a,b,c

u=b-a = (1,2,3)

v=c-a = (-3,0,0)

now use the determinant to figure ||u x v||

- Vectors/Calculus -
**Krista**, Sunday, April 7, 2013 at 6:18pm
Thank you!

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