The ability to round a number to a number of decimal places or to a number of significant figures is essential if answers are to be written to the correct degree of accuracy asked for in a question.

When working with circles it is important to know the following definitions: The radius (r) of a circle is the distance from the centre to the outside of the circle. The diameter (d) of the circle ...

Diameter (d) is the distance across the circle through the center. Since the diameter passes through the center and connects ...