两道初二几何题一、过平行四边形ABCD的对角线交点O 作两条互相垂直的直线EG、FH与平行四边形ABCD各边分别相较于点E、F、G、H.求证:四边形EFGH是菱形二、在△ABC中,∠ABC=90°,BC的垂直平分线EF
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![两道初二几何题一、过平行四边形ABCD的对角线交点O 作两条互相垂直的直线EG、FH与平行四边形ABCD各边分别相较于点E、F、G、H.求证:四边形EFGH是菱形二、在△ABC中,∠ABC=90°,BC的垂直平分线EF](/uploads/image/z/5497657-25-7.jpg?t=%E4%B8%A4%E9%81%93%E5%88%9D%E4%BA%8C%E5%87%A0%E4%BD%95%E9%A2%98%E4%B8%80%E3%80%81%E8%BF%87%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E7%9A%84%E5%AF%B9%E8%A7%92%E7%BA%BF%E4%BA%A4%E7%82%B9O+%E4%BD%9C%E4%B8%A4%E6%9D%A1%E4%BA%92%E7%9B%B8%E5%9E%82%E7%9B%B4%E7%9A%84%E7%9B%B4%E7%BA%BFEG%E3%80%81FH%E4%B8%8E%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E5%90%84%E8%BE%B9%E5%88%86%E5%88%AB%E7%9B%B8%E8%BE%83%E4%BA%8E%E7%82%B9E%E3%80%81F%E3%80%81G%E3%80%81H.%E6%B1%82%E8%AF%81%EF%BC%9A%E5%9B%9B%E8%BE%B9%E5%BD%A2EFGH%E6%98%AF%E8%8F%B1%E5%BD%A2%E4%BA%8C%E3%80%81%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0ABC%3D90%C2%B0%2CBC%E7%9A%84%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86%E7%BA%BFEF)
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