Area of a Triangle (Leaving Cert Mathematics): Flashcards

All vertices away from $(0,0)$

$\frac{1}{2}|x_1(y_2-y_3)+x_2(y_3-y_1)+x_3(y_1-y_2)|$

Any triangle on Cartesian plane

Determinant of matrix

$\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

$6.5$ square units

$4\sqrt{2}$ units

Distance formula

All triangles in Cartesian plane