Condition for Line Tangent to Circle

Rarely Tested
Line $$lx + my + n = 0$$ tangent to circle $$(x-h)^2 + (y-k)^2 = r^2$$ if:
$$\frac{|lh + mk + n|}{\sqrt{l^2 + m^2}} = r$$
No related questions available for this formula yet.

Go back to topics

Join CAT 2026 course by 5-Time CAT 100%iler

Start your IIM journey with the right preparation and crack CAT 2026.

Enroll Now