If the line `lx+my+n=0` is tangent to the circle `x^2+y^2-2ax=0` then find the condition

If the line lx+my+n=0 is tangent to the circle x^(2)+y^(2)=a^(2) , then find the condition.

The line lx+my+n=0 is a tangent to the curve y=x-x^2+x^3 , then

If the line ax+by+c=0 is a tangent to the parabola y^(2)-4y-8x+32=0, then :

If lx + my + n = 0 is tangent to the parabola x^(2)=y , them

If the line Ix+my+n=0 is a tangent to the parabola y^(2)=4ax, then locus of its point of contact is:

If the line ax+by=2 is a normal to the circle x^(2)+y^(2)-4x-4y=0 and a tangent to the circle x^(2)+y^(2)=1, then a and bare

If the line y=2-x is tangent to the circle S at the point P(1,1) and circle S is orthogonal to the circle x^(2)+y^(2)+2x+2y-2=0 then find the length of tangent drawn from the point (2,2) to the circle S

The line 2x-y+1=0 is tangent to the circle at the point (2,5) and the centre of the circles lies on x-2y=4 The radius of the circle is: