菱形證明題(范文3篇)證明
菱形的判定證明題練習(xí)1如圖,梯形ABCD中,AB∥CD,AC平分∠BAD,CE∥AD交AB于點(diǎn)E.求證:四邊形AECD是菱形.CBA E已知:如圖,在A(yíng)BCD中,AE是BC邊上的... [全文]
菱形的判定證明題練習(xí)1如圖,梯形ABCD中,AB∥CD,AC平分∠BAD,CE∥AD交AB于點(diǎn)E.求證:四邊形AECD是菱形.CBA E已知:如圖,在A(yíng)BCD中,AE是BC邊上的... [全文]
64363811、平行四邊形ABCD中,AB⊥AC,AB=1,BC= 根號(hào)5,對(duì)角線(xiàn)AC,BD相交于點(diǎn)O,將直線(xiàn)AC繞點(diǎn)O順時(shí)針旋轉(zhuǎn),分別交BC,AD于點(diǎn)E,F.(1)證明:當(dāng)旋... [全文]