Area of a Triangle (Leaving Cert Mathematics): Quizzes

$\frac{1}{2}|x_1y_2 - x_2y_1|$

When one vertex is at origin (0,0)

To ensure area is always positive

Multiply $x_1$ by $y_2$ and $x_2$ by $y_1$

When no vertex is at the origin

No, area stays the same

5.5 square units

Subtract 2 from x's, 4 from y's

Multiply by $\frac{1}{2}$

Forgetting absolute value

Area is double the correct value

Yes, result will be the same