Find the equation of the circle of radius a, in the first quadrant, which touches both the axes.

Find the area of a circle of radius 35 cm.

Find the equation of the circle whose centre is (2, 3) and which touches the line 3x - 4y - 1 = 0.

Find the equation of the circle of radius 5 units which is concentric with the circle x ^2 + y ^2 + 2x - 4y = 0

Find the equation of a circle whose centre is (1,2) and radius 2.

Find the equation of the circle whose radius 4 and which is concentric with the circle x ^2 + y ^2 + 2x - 6y = 0.

Find the equation of the circle whose centre is (4, 5) and which passes through the centre of the circle x ^2 + y ^2 + 4x -6y - 12 = 0

Find the areas of the circle of radius 3.458 cm upto correct significant figures.

Find the equation of the circle described on the line segment joining the points (5, 3) and (3, 1) as a diameter.

Find the equation of a circle whose centre is the origin and passes through the point (2,-4).