+ 5 = 15 inches. Choices (A) and (B) are too small, (C) calculates the length with XY, and
(E) doesn’t consider the radii overlapping in XY.
57 . A The problem gives us no information about the relative lengths of the different diameters, so
it must not matter, and the easiest thing to do is to make them all the same. There are five
diameters, so = 12. A circle with diameter 12 has a circumference of 12π, so a
semicircle with diameter 12 will have a length of (12π) = 6π. There are 5 semicircles, so
the total distance from F to A along the semicircles is (5)(6π) = 30π.
