Video: Lub kaum sab xis yog tsim los ntawm cov kab sib tshuam?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ntsug lub kaum sab xis yog khub ntawm cov ces kaum tsim los ntawm ob kev sib tshuam kab . Ntsug lub kaum sab xis tsis nyob ib sab lub kaum sab xis -lawv yog opposite ib leeg. Hauv daim duab no, lub kaum sab xis a thiab c yog ntsug lub kaum sab xis , thiab lub kaum sab xis b thiab d yog ntsug lub kaum sab xis . Ntsug lub kaum sab xis yog concruent.
Ua li no, ob hom kaum uas tsim los ntawm cov kab sib tshuam yog dab tsi?
Thaum twg ob kab sib tshuam lawv form ob khub ntawm opposite lub kaum sab xis , A + C thiab B + D. Lwm lo lus rau opposite lub kaum sab xis yog ntsug lub kaum sab xis . Ntsug lub kaum sab xis yeej ib txwm congruent, uas txhais tau hais tias lawv sib npaug. Nyob ib sab lub kaum sab xis yog lub kaum sab xis uas tawm ntawm tib vertex.
Tsis tas li ntawd, txoj kab sib tshuam yog dab tsi? Kev sib tshuam kab thiab Angles. Ob kev sib tshuam kab daim ntawv 4 lub kaum sab xis. Peb hu rau 2 lub ces kaum uas nyob ib sab thiab uas tsim ib tug ncaj kab "linear khub", los yog "cov ces kaum ntxiv", thiab lawv cov lej yog 180 °.
Ib yam li ntawd, cov kaum sab xis tsim los ntawm cov kab sib tshuam li cas?
Ob tug kab nyob rau hauv daim duab Ib tug tsis hla ib leeg ntawm 90 °, thiab uas ua rau lawv tsis-perpendicular kev sib tshuam kab . Cov kab qhia tias ob qho tib si lub kaum sab xis zoo ib yam, kuj hu ua congruent. Thaum ob kab sib tshuam , lawv tsim ntsug lub kaum sab xis , tej zaum hu ua opposite lub kaum sab xis , yog congruent.
Puas yog cov kab sib txuas sib txuas?
Yog ob kab sib npaug yog txiav los ntawm ib tug transversal, cov ces kaum sib raug kev sib haum xeeb . Yog ob kab yog txiav los ntawm ib tug transversal thiab cov ces kaum sib raug kev sib haum xeeb , cov kab yog parallel . Sab hauv Angles ntawm Tib Sab ntawm Transversal: Lub npe yog ib qho kev piav qhia ntawm "qhov chaw" ntawm cov ces kaum no.
Pom zoo:
Lub kaum sab xis ntawm qhov cuam tshuam cuam tshuam li cas rau cov tsos ntawm cov ntshav?
Thaum cov ntshav raug cuam tshuam, cov tee dej tau tawg los ntawm huab cua. Thaum cov tee dej no tawm tsam ib qho chaw, cov duab ntawm cov stain hloov nyob ntawm lub kaum sab xis ntawm qhov cuam tshuam, kev tshaj tawm, kev ncua deb thiab hom ntog cuam tshuam. Raws li lub kaum sab xis ntawm qhov cuam tshuam hloov, yog li qhov tshwm sim ntawm qhov tshwm sim stain
Thaum ib tug transversal cuam tshuam ob kab sib luag uas lub kaum sab xis yog congruent?
Yog hais tias ib tug transversal intersects ob parallel kab, ces alternate sab hauv cov ces kaum yog congruent. Yog hais tias ib tug transversal intersects ob parallel kab, ces tib-sab sab hauv cov ces kaum yog ntxiv
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