Cov nqe lus twg ua pov thawj tias WXYZ yog daim duab sib npaug?
Cov nqe lus twg ua pov thawj tias WXYZ yog daim duab sib npaug?

Video: Cov nqe lus twg ua pov thawj tias WXYZ yog daim duab sib npaug?

Video: Cov nqe lus twg ua pov thawj tias WXYZ yog daim duab sib npaug?
Video: Nqua Hu Cov Txiv Meej Tsav 2024, Kaum ib hlis
Anonim

LUS TEB: Tsis yog; ob leeg ntawm ob sab sib txawv yuav tsum yog sib luag; txij li txoj kab nqes ntawm ≠ nqes hav ntawm, ABCD tsis yog parallelogram . nruab nrab point,. Txij li cov diagonals bisect ib leeg, WXYZ yog parallelogram.

Kuj paub, nqe lus twg ua pov thawj tias quadrilateral VWXY yog ib qho parallelogram?

triangles yog congruent. Yog hais tias ob khub ntawm ob sab sib npaug ntawm a quadrilateral yog sib xws, tom qab ntawd quadrilateral yog a parallelogram . Yog tias - AB ≅ - CD thiab - BC ≅ - DA, ces ABCD yog parallelogram . Yog tias ob khub ntawm cov ces kaum sib txawv ntawm a quadrilateral yog sib xws, tom qab ntawd quadrilateral yog a parallelogram.

Kuj Paub, qhov twg yuav tsum yog parallelogram? Ib quadrilateral Yuav tsum yog parallelogram yog hais tias nws muaj ib khub ntawm opposite sab ob qho tib si parallel thiab congruent. Ib quadrilateral Yuav tsum yog parallelogram yog hais tias nws muaj ob khub ntawm nws cov opposite ces kaum congruent (los yog sib npaug ntawm kev ntsuas). Ib quadrilateral Yuav tsum yog parallelogram yog hais tias nws muaj ob lub diagonals bisecting ib leeg.

Cov lus nug tseem yog, nqe lus twg muaj tseeb txog txhua qhov parallelograms?

Txhua plaub sab yog congruent. Txhua plaub lub ces kaum yog kaum sab xis. Cov diagonals sib sib zog nqus.

Koj ua pov thawj li cas rau plaub fab yog ib daim duab sib npaug ntawm daim duab?

Rau pov thawj tias nws yog a parallelogram , nco ntsoov tias lub ntsiab txhais ntawm a parallelogram yog a quadrilateral nrog ob khub ntawm ob sab sib luag. Yog li ntawd, ib qho txoj kev ua pov thawj nws yog ib parallelogram yog kom paub tseeb tias cov opposite sab yog parallel. Los ntawm algebra, nco ntsoov tias ob kab sib npaug yog tias lawv muaj tib txoj kab nqes.

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