Find the equation of the circle whose centre is (1,2) and which toucfhes x-axis.

Find the equation of the circle whose centre is (h, k) and which touches : x-axis.

Find the equation of the circle whose centre is (h, k) and which touches : y-axis.

Find the equation of the circle whose centre is (h, k) and which touches : both axes.

Find the equation of the circle whose centre is (-3, 2) and radius 4.

Find the equation of the circle whose centre is the point (1,-2) and which passes through the centre of the circle x^2 + y^2 + 2y = 3 .

Find the equation of the circle whose centre is (2, -1) and which passes through (3, 6).

Find the equation of the circle whose centre is (2, -3) and which passes through the intersection of the straight lines 3x-2y=1 and 4x+y = 27.

Find the equation of the circle whose centre is (2, -3) and which passes through the intersection of the st. lines 3x+2y=11 and 2x+3y=4.

Find the equation of the circle whose radius is 5 and which touches the circle x^2 + y^2-2x- 4y- 20 = 0 externally at the point (5, 5).