helloo i need to get an answer for this question

Show that the line y = mx + c touches the circle x^2 + y^2 = a^2 if c^2 = a^2(1+m^2)

it's very hard for me (Thinking) i need some help plz.

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- Oct 8th 2009, 09:47 AMMathboyim confused
helloo i need to get an answer for this question

Show that the line y = mx + c touches the circle x^2 + y^2 = a^2 if c^2 = a^2(1+m^2)

it's very hard for me (Thinking) i need some help plz. - Oct 8th 2009, 11:14 AMramiee2010Quote:

Show that the line y = mx + c touches the circle x^2 + y^2 = a^2 if c^2 = a^2(1+m^2)

if the line y = mx + c touches the circle(or tangent to the circle) then

- Oct 8th 2009, 11:24 AMMathboy
Any help about this also?

The point (p,q) lies on the circle x^2 + y^2 = a^2.

Show that the equation of the tangent to the circle at (p,q) is px + qy = a^2 - Oct 8th 2009, 11:55 AMramiee2010
the equation of the tangent to the circle having centre at origin is given by

therefore equation of the tangent