Life expectancy among adults 45 and 65 years of age by family income, sex, and r

游客2024-01-12 58

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

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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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