2 kab ntawm daim duab peb sab txhais li cas?
2 kab ntawm daim duab peb sab txhais li cas?

Video: 2 kab ntawm daim duab peb sab txhais li cas?

Video: 2 kab ntawm daim duab peb sab txhais li cas?
Video: Saib Mis paub Poj niam (hluas nkauj) tus yam ntxwv lub siab 2024, Kaum ib hlis
Anonim

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.

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