How do you round 959 to the nearest thousand

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

Can someone me and plz do the problem