The circumference of a circle is the distance around the shape. The ability to round a number to a number of decimal places or to a number of significant figures means that answers can be written to ...

The radius of a circle or a sphere is the distance between the center and the edge. The radius can be used to calculate a circle's diameter, area and circumference. Likewise, a sphere's volume is ...

Remember the old song "500 Miles Away From Home"? Think of it as a challenge instead of a lament and you could come up with some good ideas for a road trip. You can do it the old-fashioned way, ...