Equation of a Tangent to a Circle (Grade 12 NSC Matric Mathematics): Flashcards

Line touching circle at exactly one point

Point where tangent meets the circle

Always perpendicular

$90°$

$m_1 imes m_2 = -1$

$-1$

$(x - a)^2 + (y - b)^2 = r^2$

$(a; b)$

-rac{1}{m_{ ext{radius}}}

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