The resulting answer would be 4.70 which has 3 significant figures. In this example you would want to enter 2.00 for the multiplier constant so that it has the same number of significant figures as the radius entry. You can think of constants or exact values as having infinitely many significant figures, or at least as many significant figures as the the least precise number in your calculation. Your resulting calculation will be rounded from 4.70 to 5, which is clearly not the correct answer to the diameter calculation d=2r. If you use this calculator for the calculation and you enter only "2" for the multiplier constant, the calculator will read the 2 as one significant figure. 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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