急,关于勾股定理的3道数学题1.如图1所示,Rt△ABC的面积为20平方厘米,在AB的同侧,分别以AB,BC,CA为直径做三个半圆,求阴影部分的面积.2.已知Rt△ABC中,∠ACB=90度,CA=CB,有一个圆心角为45度,半径长等
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![急,关于勾股定理的3道数学题1.如图1所示,Rt△ABC的面积为20平方厘米,在AB的同侧,分别以AB,BC,CA为直径做三个半圆,求阴影部分的面积.2.已知Rt△ABC中,∠ACB=90度,CA=CB,有一个圆心角为45度,半径长等](/uploads/image/z/12078639-63-9.jpg?t=%E6%80%A5%2C%E5%85%B3%E4%BA%8E%E5%8B%BE%E8%82%A1%E5%AE%9A%E7%90%86%E7%9A%843%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%981.%E5%A6%82%E5%9B%BE1%E6%89%80%E7%A4%BA%2CRt%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA20%E5%B9%B3%E6%96%B9%E5%8E%98%E7%B1%B3%2C%E5%9C%A8AB%E7%9A%84%E5%90%8C%E4%BE%A7%2C%E5%88%86%E5%88%AB%E4%BB%A5AB%2CBC%2CCA%E4%B8%BA%E7%9B%B4%E5%BE%84%E5%81%9A%E4%B8%89%E4%B8%AA%E5%8D%8A%E5%9C%86%2C%E6%B1%82%E9%98%B4%E5%BD%B1%E9%83%A8%E5%88%86%E7%9A%84%E9%9D%A2%E7%A7%AF.2.%E5%B7%B2%E7%9F%A5Rt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0ACB%3D90%E5%BA%A6%2CCA%3DCB%2C%E6%9C%89%E4%B8%80%E4%B8%AA%E5%9C%86%E5%BF%83%E8%A7%92%E4%B8%BA45%E5%BA%A6%2C%E5%8D%8A%E5%BE%84%E9%95%BF%E7%AD%89)
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