2. 外语
  3. Life expectancy among adults 45 and 65 years of age by family income, sex, and race: United States, average annual 1979-89 In

Life expectancy among adults 45 and 65 years of age by family income, sex, and race: United States, average annual 1979-89 In

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问题 Life expectancy among adults 45 and 65 years of age by family income, sex, and race: United States, average annual 1979-89

In the figure above, the diameter of the circle is 20 and the area of the shaded region is 80π. What is the value of a + b + c + d?
选项 A、144
B、216
C、240
D、270
E、288
答案E
解析
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