Video: 2 kab ntawm daim duab peb sab txhais li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thaum a daim duab peb sab muaj ob congruent sab nws yog hu ua isosceles daim duab peb sab . Cov ces kaum opposite rau lub ob sab ntawm tib qhov ntev yog congruent. A daim duab peb sab tsis muaj ib sab los yog lub kaum sab xis yog hu ua scalene daim duab peb sab . Thaum twg ob daim duab peb sab nws congruent txhais tau tias tias lawv muaj qhov loj thiab zoo tib yam.
Ib yam li ntawd, nws nug, 2 kab ntawm ib sab ntawm daim duab peb sab txhais li cas?
A daim duab peb sab yog ib 2D duab nrog peb sab . Nyob ntawd yog plaub txawv daim duab peb sab nrog cov khoom sib txawv. Ib isosceles daim duab peb sab muaj 2 sab ntawm qhov sib npaug. Dashes ntawm lub kab qhia lawv yog sib npaug ntawm qhov ntev. Lub kaum sab xis ntawm lub hauv paus ntawm qhov sib npaug sab yog sib npaug.
Qhov thib ob, 2 kab txhais li cas hauv geometry? Tick marks (pom hauv txiv kab ntxwv) qhia ob sab ntawm cov duab uas muaj qhov ntev sib npaug (sab ntawm cov duab uas sib haum lossis qhov sib tw). Ib leeg kab qhia tias ob ntsug kab yog tib qhov ntev thaum ob kab qhia tias ob kab pheeb ces kaum kab yog tib qhov ntev.
Hauv qhov no, cov cim hash ntawm daim duab peb sab txhais li cas?
Hom ntawm Daim duab peb sab Ua ntej tshaj plaws, a daim duab peb sab uas tsis muaj congruent sab yog hu ua scalene. Tus lej tsis sib npaug ntawm cov cim nyob rau hauv txhua sab qhia tias tsis muaj ob sab muaj tib qhov ntev. Isosceles Daim duab peb sab . Tom ntej no, a daim duab peb sab nrog ob sab congruent yog hu ua isosceles.
Koj piav txog daim duab peb sab li cas?
A daim duab peb sab muaj peb sab, peb vertices, thiab peb lub ces kaum. Tus lej ntawm peb lub kaum sab hauv ntawm a daim duab peb sab yog ib txwm 180 °. Qhov sib npaug ntawm qhov ntev ntawm ob sab ntawm a daim duab peb sab yog ib txwm ntau dua qhov ntev ntawm peb sab. A daim duab peb sab nrog vertices P, Q, thiab R yog denoted li ?PQR.
Pom zoo:
Dab tsi yog equidistant los ntawm peb sab ntawm daim duab peb sab?
Lub ntsiab lus uas sib npaug rau txhua sab ntawm daim duab peb sab yog hu ua incenter: Ib qho nruab nrab yog ib qho kab uas muaj ib qho ntawm nws qhov kawg ntawm lub vertex ntawm daim duab peb sab thiab lwm qhov kawg ntawm qhov nruab nrab ntawm sab opposite lub vertex. Peb qhov nruab nrab ntawm ib daim duab peb sab sib ntsib hauv centroid
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
Koj ua pov thawj li cas ntawm cov ces kaum sab nrauv ntawm daim duab peb sab yog 360?
Lub kaum sab nrauv ntawm daim duab peb sab yog sib npaug rau qhov sib npaug ntawm cov kaum sab hauv sab nraud. Yog xav paub ntxiv txog qhov no saib Daim duab peb sab sab nraud lub kaum sab xis theorem. Yog tias lub kaum sib npaug raug coj los ntawm txhua qhov vertex, cov ces kaum sab nrauv ib txwm ntxiv rau 360 ° Qhov tseeb, qhov no muaj tseeb rau txhua qhov convex polygon, tsis yog daim duab peb sab
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