Video: Lub quadrilateral puas muaj ib lub kaum sab xis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
A quadrilateral yog muab xws li 1: tag nrho cov sab sib npaug thiab 2: ob lub kaum sab xis ntxiv rau 90 degrees. Lub opposite ces kaum ntawm a quadrilateral yog txoj cai lub kaum sab xis. Cov quadrilateral yog tsis yog rhombus.
Ntawm no, dab tsi yog quadrilateral nrog ib lub kaum sab xis?
Ib lub square tuaj yeem txhais tau tias yog lub rhombus uas tseem yog lub duab plaub - hauv lwm lo lus, ib qho parallelogram nrog plaub sab sib xyaw thiab plaub. txoj cai lub kaum sab xis. Ib tug trapezoid yog ib quadrilateral nrog raws nraim ib khub ntawm parallel sab. (Tej zaum yuav muaj qee qhov tsis meej pem txog lo lus no nyob ntawm seb koj nyob hauv lub tebchaws twg.
Qhov thib ob, puas tuaj yeem muaj plaub lub kaum sab xis tsuas muaj ib khub ntawm cov kaum sab xis? Ib tug trapezoid yog ib quadrilateral nrog ib khub ntawm opposite sab parallel. Nws ua tau muaj txoj cai kaum (a txoj cai trapezoid), thiab nws tuaj yeem muaj congruent sab (isosceles), tab sis cov no tsis tas yuav.
Ntxiv mus, lub quadrilateral puas muaj 1 txoj cai kaum?
Qhov sum ntawm ob opposite lub kaum sab xis ntawm a quadrilateral yog 172', thiab lwm yam lub kaum sab xis sib npaug. Ib qho tshwj xeeb quadrilateral muaj opposite sab uas yog parallel thiab ib ntawm lub kaum sab xis yog a sab xis.
Dab tsi muaj ib lub kaum sab xis?
Cov txoj cai daim duab peb sab muaj ib lub kaum sab xis 90 degree thiab ob tug mob (< 90 degree ) cov ces kaum. Txij li cov sum ntawm cov ces kaum ntawm daim duab peb sab yog ib txwm 180 degrees Ob sab ntawm daim duab peb sab uas yog los ntawm sab xis yog hu ua ob txhais ceg thiab sab opposite ntawm lub sab xis hu ua hypotenuse.
Pom zoo:
Dab tsi yog lub kaum sab xis sum khoom ntawm ib lub quadrilateral?
Raws li lub kaum sab xis ntawm cov cuab yeej ntawm Quadrilateral, cov lej ntawm tag nrho plaub lub kaum sab hauv yog 360 degrees
Cov kab lus hloov sab hauv cov ces kaum piav qhia txoj haujlwm ntawm ob lub kaum sab xis li cas?
Hloov sab hauv cov ces kaum yog tsim los ntawm ib tug transversal intersecting ob parallel kab. Lawv nyob nruab nrab ntawm ob qho tib si kab tab sis nyob rau sab nraud ntawm lub transversal, tsim ob khub (plaub tag nrho cov ces kaum) ntawm cov ces kaum sab hauv. Hloov cov ces kaum sab hauv yog congruent, txhais tau tias lawv muaj qhov sib npaug
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
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