Draw the circles whose equation are
$x^{2} + y^{2} = 2 a y .$

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Solution

Given equation of circle is $x^{2} + y^{2} = 2 a y .$
Making perfect square, we get
$(x - 0)^{2} + (y - a)^{2} = a^{2}$
So, centre of the circle is $C (0, a)$ and radius $r = a$
Now draw a circle with radius $a$ and centre $(0, a)$ .

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