![]() ![]() If you measure a radius of 2.35, multiply by 2 to find the diameter of the circle: 2 * 2.35 = 4.70 If you are entering a constant or exact value as you might find in a formula, be sure to include the proper number of significant figures.įor example, consider the formula for diameter of a circle, d = 2r, where diameter is twice the length of the radius. ![]() Note: Doing Math With Significant Figures So in water, one wavelength of a 52 Hz whale call is 28 meters long. In this case 52 has the fewest number of significant digits, so you should round the final answer to 2 sig figs.Ģ8.4615384 meters rounded to 2 sig figs = 28 meters.
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