The circumference of a circle is 137 m. Find its diameter, in meters.

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

What is best way to getting answer for my exam is

Which expression gives you the distance between the points (5,1)and(9,-6)