Answer to Question #249259 in Algebra for Jantung

Question

You measure the radius of a wheel to be 41,6 cm. If you multiply by 2 to get the diameter, should you write the result as 8 cm or as 8.32 cm? Justify your answer

Answer 1

The correct value of the diameter of the wheel is 8.32cm, since the radius is expressed in significant figures, the diameter cannot be approximated.

The result should be written as 8.32 cm. The factor of 2 used to convert radius to diameter is exact. It has no uncertainty, and so does not change the number of significant figures.