How to find the area of a triangle given 3 vertices?

By using MATLAB find the area of the triangle with vertices (3,1,0), (1,1,1) and (0, -2,-1).

I tried using polyarea, sounds good, doesn't work, never gonna happen.

Answer 1

[Jos (10584)]

1. Pick one vertex, let say V1, as "origin"
2. Get the two vectors of from this point to the other two points (V2-V1) and (V3-V1)
3. Calculate the cross product between these two vectors
4. The magnitude of this cross product is half the size of your triangle

More info? Google is your friend ...

[Morgan Rory Didelin]

But then google sends us here, like a never ending google loop.

[Zachary]

The magnitude of the cross product is twice the area of the triangle (meaning you need to divide the cross product by 2), i think you just misspoke, but wanted to clarify in case anyone was genuinely lost, mathwise.