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[AB]U[BC]U[CA]

B. A. [AB]U[BC]U[CA]. se numeste TRIUNGHI. C. N. M. A. P. B. C. A’. C’. B’. Triunghi oarecare. Triunghiul echilateral. Triunghiul isoscel. A’. B’. A. C. B. C’. A. A’. C. C’. B. B’. A. B. C. M. N. P. Congruen ţ a triunghiurilor.

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[AB]U[BC]U[CA]

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  1. B A [AB]U[BC]U[CA] se numeste TRIUNGHI C

  2. N M A P B C A’ C’ B’ Triunghi oarecare Triunghiul echilateral Triunghiul isoscel

  3. A’ B’ A C B C’

  4. A A’ C C’ B B’

  5. A B C M N P Congruenţa triunghiurilor Faptul că ΔABC este congruent cu ΔMNP (adică ΔABC ΞΔMNP ) înseamnă şase congruenţe: 1.[AB] Ξ[MN] sau AB=MN 2.[AC] Ξ[MP] sau AC=MP 3.[BC] Ξ[NP] sau BC=NP 4.≮ABC Ξ ≮MNPsau m(≮ABC) Ξm(≮MNP) 5.≮BAC Ξ ≮NMPsau m(≮BAC) Ξm(≮NMP) 6.≮ACB Ξ ≮MPN sau m(≮ACB) Ξ m(≮MPN)

  6. A A’ B B' M M’ C C’ N N’ P’ P EXERCITIUL 1. STIIND CA CELE 4 CAZURI DE CONGRUENTA SUNT LUL ULU LLL LUU SA SE PRECIZEZE CAZURILE DE CONGRUENTA PT URMATOARELE TRIUNGHIURI: a) LUL b) ULU

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