Area of Triangle Given 3 vertices

Question

Given that $P=(1,1,0), Q=(1,0,1), R=(0,1,1)$. I need to find the area of the triangle.

What I have done:

I have tried finding the distances of PQ, QR, and PR. I have those distances, I don't know what I do next.

Answer 1

You can use Heron's formula. Alternatively, you can calculate an altitude, for example, the distance from $P$ to the line $QR$.