Question

# A circle with center (4,-5) is tangent to ( Y ) -axis in the standard ( (x, y) ) coordinate What is the radius of this circle?

Solution

The circle is tangent to y-a is and untered

The urcu is tangerir

at (4,-5) the point of tangency is (0,-5)

The distance between (4,-5) and (0,-5) is 4 .

radius ( gamma=4 )

Equativn

( (x-y)^{2}+(y+5)^{2}=4^{2} )

( (x-y)^{2}+(y+5)^{2}=16 )