1、△ACB ≌ NMR,△DEF ≌ △QOP.
2、在△ABC和△CDA中,
∵AB = CD, ∠BAC= ∠DCA,
AC = CA,
∴△ABC ≌ △CDA(SAS).
3、∵AB ⊥ CD,∠ABC = ∠DBE = 90°.又
AB = DB,BC = BE,
∴△ABC ≌△DBE(SAS).
4、(1) ∵AD = AE, ∠1 = ∠2, AO = AO,
∴△AOD ≌ △AOE( SAS).
(2) ∵AC = AB,∠1 = ∠2, AO = AO,
∴△AOC ≌ △AOB( SAS).
(3) ∵AB = AC,∠BAD = ∠CAE,AD = AE,∴△ABD ≌△ACE( SAS).