Cov txheej txheem:

Dab tsi yog cov lus ntxeev sab ntawm daim duab plaub?
Dab tsi yog cov lus ntxeev sab ntawm daim duab plaub?

Video: Dab tsi yog cov lus ntxeev sab ntawm daim duab plaub?

Video: Dab tsi yog cov lus ntxeev sab ntawm daim duab plaub?
Video: Tswv Yexus lub neej thaum pib txug thaum xaus 2024, Kaum ib hlis
Anonim

Hauv Euclidean geometry , a parallelogram yog ib qho yooj yim (tsis-tus kheej-kev sib tshuam) quadrilateral nrog ob khub ntawm parallel sab . Cov rov qab los yog ntsib ob sab ntawm daim duab plaub yog qhov ntev sib npaug thiab opposite kaum ntawm parallelogram yog qhov ntsuas sib npaug.

Yooj yim li ntawd, koj yuav pom cov lus sib thooj ntawm daim duab sib dhos li cas?

Muaj rau yam khoom tseem ceeb ntawm cov duab sib dhos kom paub:

  1. Cov sab nraud yog congruent (AB = DC).
  2. Cov tim tswv sib txawv yog sib haum (D = B).
  3. Cov ces kaum sib ntxiv yog ntxiv (A + D = 180 °).
  4. Yog tias ib lub kaum sab xis yog qhov zoo, ces txhua lub ces kaum yog txoj cai.
  5. Lub diagonals ntawm ib tug parallelogram bisect ib leeg.

Tsis tas li ntawd, 4 yam khoom ntawm parallelogram yog dab tsi? Parallelogram muaj cov khoom hauv qab no:

  • Ob sab sib tw yog qhov sib thooj los ntawm kev txhais.
  • Cov sab nraud yog congruent.
  • Lub kaum ntse ntse sib txawv yog sib xws.
  • Cov kaum sib law liag yog ntxiv.
  • Cov diagonals sib sib zog nqus.

Nyob rau hauv kev hwm rau qhov no, puas yog opposite sab ntawm lub parallelogram congruent?

Lub quadrilateral yog ib parallelogram yog: Los yog: Ob khub ntawm ob sab yog kev sib haum xeeb . Yog lawv kev sib haum xeeb , lawv kuj yuav tsum yog parallel.

Dab tsi yog cov yam ntxwv ntawm parallelogram?

Convex ntau yam

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