Triangle with One Point at (0,0) (Leaving Cert Mathematics): Flashcards

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

$\sqrt{x_1^2 + y_1^2}$

$\sqrt{x_2^2 + y_2^2}$

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

$m = \frac{y_1}{x_1}$

$y = mx$ where $m = \frac{y_1}{x_1}$

$m = \frac{y_2-y_1}{x_2-x_1}$

$y - y_1 = m(x - x_1)$

Area, side lengths, slopes & equations of sides

$9$ square units

$5$ units

Simplifies coordinate geometry calculations