Question

Please help... what is the equation of all the circles with fixed radius r and tangent to the x-axis...

Answer 1

center of the circle will be (x,y)=(a,-r)

Answer 2

can you give me an equation..:))

Answer 3

or (x,y)=(a,r)
then equation will be

Answer 4

\[(x-a)^2+(y \pm r)^2=r^2\]

Answer 5

why is it+-?

Answer 6

that means + or - and u have 2 equation
\[(x-a)^2+(y-r)^2=r^2 \\ \\ (x-a)^2+(y+r)^2=r^2\]

Answer 7

ok.. thank you very much:))

Answer 8

yw