选择题
2024 AMC 8 Problem 18: Concentric Circles
Three concentric circles centered at O have radii of 1, 2, and 3. Points B and C lie on the largest circle. The region between the two smaller circles is shaded, as is the portion of the region between the two larger circles bounded by central angle BOC, as shown in the figure. Suppose the shaded and unshaded regions are equal in area. What is the measure of ∠BOC in degrees?
2024 AMC 8 第 18 题：同心圆
以 O 为圆心的三个同心圆，半径分别为 1、2 和 3。点 B 和 C 位于最大的圆上。两个较小圆之间的区域被涂上阴影，两个较大圆之间以圆心角 BOC 为界的区域部分也是如此，如图所示。假设阴影区域和非阴影区域的面积相等。 ∠BOC 的度数是多少
A.
108
B.
120
C.
135
D.
144
E.
150