Summary (Grade 12 NSC Matric Mathematics): Quizzes

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

Steepness of line; 'rise over run'

Add the coordinates and divide by 2

When all gradients between points equal

$m_1 = m_2$

$m_1 \times m_2 = -1$

$-\frac{1}{m}$

Gradient-intercept form: $y = mx + c$

$x^2 + y^2 = r^2$

The radius is perpendicular to tangent