The figure below consists of four semicircles and the 16-cm diameter of the largest semicircle. What is the total number of square cm in the area of the two shaded regions? Use 3.14 as an approximation for $\pi$, and express your answer as a decimal to the nearest tenth.
+23252 Use the formula Area = ½·pi·radius2 to find the areas of the following semi-circles.
Step 1) Find the area of the largest semi-circle; it would be grey if it were competely
shaded and its radius is 8.
Step 2) Find the area of the next-largest semi-circle; it would be white if it were completely
shaded and its radius is 6.
Step 3) Find the area of the second-smallest semi-circle; it would be grey if it were completely
shaded and its radius is 4.
Step 4) Find the area of the smallest semi-circle; it would be white if it were completly
shaded and its radius is 2.
Start with the answer of Step 1; subtract the area of Step 2; add the area of Step 3; and, finally,
subtract the area of Step 4.
