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HMMT 二月 2000 · GEN 赛 · 第 20 题

HMMT February 2000 — GEN Round — Problem 20

专题
Contest Math / 竞赛数学
难度
L3
来源
HMMT

题目详情

英文原题

  1. Giv en: AC has length 5, semi ir le AB has radius 1, semi ir le B C has diameter 3.
    What p er en t of the the big ir le is shaded?
    A CB Æ
解析

英文解析

  1. The area of the big ir le is ( ) = . The area of the ir le with diameter AB is
    2 4
    , and the area of the ir le with diameter B C is . Th us, the p er en tage of the big 9
    25 94
    25 4 912
    4 4
    ir le that is shaded is = = = 48% .
    25 2525 4