Question

How to find the area of triangle whose vertices are `(3,-1),(2,7) and (-5,6)` ?

Answer 1

The best way is called the Shoelace Formula:

`A = 1/2 | 3(7) - (-1)(2) + 2(6) - 7(-5) + (-5)(-1) - 6(3) | = 57/2`

Answer 2

I have solved this way. Please, see the answer below: