Area of a Circle - Definition, Formula, Derivation with Solved Examples

(a) A circle has equation x^2 y^2 - 2x - 4y - 20 = 0. Find the equation of the tangent to the circle at the point P(-3,5).(6) Let Q (x, y) be a point outside the circle; x y = 7 and let y = mx c be the equation of a tangent drawn from Q to the circle.Show thatx^2 (m^2 2)x (y^2 - 2my c^2 - 20) = 0.

The equation of the tangent to the circle x2 y2=a2,which makes... | Filo

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