Find the following ratios:
The diameter of a circle to it circumference.

Find the ratio of the diameter of a circle ot its circumference in the reduced form.

Find the following ratios: The side of a square to its perimeter.

Find the area of the circle if its circumfer­ence is 88 cm.

Find the following ratios.The ratio of circumference of circle with radius r to its area.

If the lines 2x+3y+1=0 and 3x-y-4=0 lie along diameters of a circle of circumference 10 pi , then the equation of the circle is

If the lines 2x+3y+1=0 and 3x-y-4=0 lie along diameters of a circle of circumference 10pi , then the equation of the circle is