Cov txheej txheem:

Puas yog daim duab peb sab congruent muaj tib lub perimeter?
Puas yog daim duab peb sab congruent muaj tib lub perimeter?

Video: Puas yog daim duab peb sab congruent muaj tib lub perimeter?

Video: Puas yog daim duab peb sab congruent muaj tib lub perimeter?
Video: Saib Mis paub Poj niam (hluas nkauj) tus yam ntxwv lub siab 2024, Kaum ib hlis
Anonim

Yog ob daim duab peb sab yog kev sib haum xeeb , ces txhua feem ntawm cov daim duab peb sab (sab los yog kaum) yog kev sib haum xeeb mus rau qhov sib thooj nyob rau hauv lwm yam daim duab peb sab . Ntxiv nrog rau sab thiab cov ces kaum, tag nrho lwm yam khoom ntawm lub daim duab peb sab yog cov ib yam kuj, xws li cheeb tsam, ib puag ncig , qhov chaw ntawm cov chaw, lub voj voog thiab lwm yam.

Nyob rau hauv no hais txog, puas congruent triangles muaj tib cheeb tsam?

Yog ob triangles yog congruent , ces lawv yuav muaj tus tib cheeb tsam thiab perimeter. Yog ob daim duab peb sab yog zoo sib xws nyob rau hauv ratio R R R, ces qhov ratio ntawm lawv perimeter yuav R R R R thiab qhov ratio ntawm lawv cheeb tsam yuav yog R2 R^2 R2.

Kuj Paub, ua li cas koj thiaj paub tias daim duab peb sab yog congruent? Ob daim duab peb sab yog concru yog lawv muaj: raws nraim tib yam peb sab thiab. raws nraim tib lub kaum sab xis.

Muaj tsib txoj hauv kev los nrhiav yog tias ob daim duab peb sab sib dhos: SSS, SAS, ASA, AAS thiab HL.

  1. SSS (sab, sab, sab)
  2. SAS (sab, kaum sab xis, sab)
  3. ASA (lub kaum sab xis, sab, kaum sab xis)
  4. AAS (lub kaum sab xis, sab, sab)
  5. HL (hypotenuse, ceg)

Ua raws li qhov no hauv kev txiav txim siab, cov duab sib koom ua ke puas muaj tib qhov ib puag ncig?

Cov duab sib dhos muaj tib yam loj ces kaum, sab lengths, cheeb tsam, thiab ib puag ncig . Zoo sib xws cov duab muaj muaj feem cuam tshuam. Lawv cov ces kaum yog cov ib yam , thiab sab lengths qhia cov ib yam proportions.

Cov duab peb sab twg yuav tsum sib haum?

Triangles yog congruent yog tias:

  • SSS (sab sab sab) Tag nrho peb sab sib raug zoo sib npaug ntawm qhov ntev.
  • SAS (sab lub kaum sab xis) Ib khub ntawm sab sib raug thiab lub kaum sab xis suav sib npaug.
  • ASA (lub kaum sab xis)
  • AAS (lub kaum sab xis sab)
  • HL (hypotenuse ceg ntawm txoj cai daim duab peb sab)

Pom zoo: