Cov txheej txheem:
Video: Ib daim duab plaub puas muaj plaub lub kaum sab xis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
A duab plaub muaj ob khub ntawm opposite sab parallel, thiab plaub lub kaum sab xis . Nws kuj yog ib qho parallelogram, txij li nws muaj ob khub ntawm parallel sab. Ib square muaj ob qho tib si nyob rau hauv parallel, plaub lub kaum sab xis , thiab tag nrho plaub sab sib npaug. Tsis yog, vim yog rhombus ua tsis yog muaj rau muaj 4 lub kaum sab xis.
Ib yam li ntawd, lub kaum sab xis muaj pes tsawg tus duab plaub?
plaub lub kaum sab xis
Ib sab saum toj, cov duab twg ib txwm muaj 4 lub kaum sab xis? duab plaub
Hais txog qhov no, koj ua li cas ua pov thawj tias lub duab plaub muaj 4 lub kaum sab xis?
Ua pov thawj nws yog Rectangle
- - Cov sab nraud yog sib npaug thiab sib npaug. - Cov kab pheeb ces kaum sib sib zog nqus.
- - Muaj 4 lub kaum sab xis. - Cov kab pheeb ces kaum yog congruent.
- A(0, -3), B(-4, 0), C(2, 8), D(6, 5) Cov.
- - Qhia tias ob khub ntawm ob sab sib txawv yog sib haum. - Qhia tias ob qho tib si ntawm sab nraud yog sib npaug.
Dab tsi yog qhov polygon nrog 4 txoj cai kaum thiab 4 sab?
Parallelogram: Ib qho plaub hau nrog 2 khub ntawm kev sib luag sab . Rectangle: Ib qho parallelogram nrog 4 lub kaum sab xis . Rhombus: Ib qho parallelogram nrog 4 paj nrog sib npaug ntev.
Pom zoo:
Koj tuaj yeem ua pov thawj li cas 2 daim duab peb sab zoo sib xws siv lub kaum sab xis sab SAS zoo sib xws postulate?
SAS Similarity Theorem hais tias yog ob sab hauv ib daim duab peb sab yog proportional rau ob sab hauv lwm daim duab peb sab thiab lub kaum sab xis nyob rau hauv ob qho tib si congruent, ces ob daim duab peb sab zoo ib yam. Ib qho kev hloov pauv zoo sib xws yog ib lossis ntau qhov kev hloov pauv tsis tu ncua ua raws li kev dilation
Puas yog cov kaum sab xis hauv ib daim duab peb sab isosceles ib txwm ntsuas 45?
Hauv ib daim duab peb sab isosceles, qhov sib npaug sab ua rau lub kaum sab xis. Nco ntsoov tias vim txoj cai daim duab peb sab yog isosceles, ces cov ces kaum ntawm lub hauv paus yog sib npaug. (Theorem 3.) Yog li ntawd txhua lub kaum sab xis yog 45 °
Vim li cas nws thiaj li hais tias lub Orthocenter ntawm daim duab peb sab obtuse yuav tsum nyob rau sab nraud ntawm daim duab peb sab?
Nws hloov tawm tias tag nrho peb qhov siab ib txwm sib tshuam ntawm tib lub ntsiab lus - lub npe hu ua orthocenter ntawm daim duab peb sab. Lub orthocenter tsis yog ib txwm nyob hauv daim duab peb sab. Yog tias daim duab peb sab yog obtuse, nws yuav nyob sab nraud. Txhawm rau ua kom qhov no tshwm sim cov kab qhov siab yuav tsum tau txuas ntxiv kom lawv hla
Dab tsi yog kev sib raug zoo ntawm sab nrauv thiab sab hauv lub kaum sab xis ntawm daim duab peb sab?
Cov kaum sab hauv yog hu ua Sab hauv cov ces kaum. Cov lej ntawm cov kaum sab hauv ntawm daim duab peb sab yog ib txwm 180 degrees. Lub kaum sab nrauv yog lub kaum sab xis ntawm ib sab ntawm ib qho duab, thiab ib txoj kab txuas ntxiv los ntawm sab tom ntej. Qhov sib npaug ntawm lub kaum sab nrauv thiab nws lub kaum sab hauv uas nyob ib sab kuj yog 180 degrees
Puas yog daim duab peb sab isosceles muaj ob lub kaum sab xis?
Thaum ib daim duab peb sab muaj ob sab congruent nws hu ua daim duab peb sab isosceles. Lub kaum sab xis ntawm ob sab ntawm tib qhov ntev yog congruent. Ib daim duab peb sab uas tsis muaj ib sab lossis cov kaum sab xis yog hu ua daim duab peb sab scalene