The radius of a circle is given as 2.12 cm . Its area must be expressed as

Step-by-step solution

The radius of the circle is given as r = 2.12 cm . The number of significant figures in the measured value of the radius is 3 . The area of the circle is A = r^2 . Substituting the value of r : A = (2.12)^2 = 3.14159 4.4944 = 14.1196... cm ^2 In multiplication, the final result should retain as many significant figures as are there in the original number with the least significant figures. Since the radius has 3 significant figures, the area must also be expressed to 3 significant figures. Rounding off 14.1196... c