Find the area of the given triangle using the following formula

Question

https://gyazo.com/dc2093981a3c144a03f93db7f15f49ef

Answer 1

Substitute the coordinates of the vertices, e.g,

(a, b) = (-2, 7)

(c, d) = (-6, -1)

(e, f) = (3, 4)

Now determine the determinant