Question

In following pairs of triangles, find the pairs which are congruent? Also, write the criterion of congruence.

Answer 1

Let us consider 2 triangles $\Delta ABD\Delta CDB$

From $\Delta ABD$

$\angle D={30}^o$

$\angle B={20}^o$

$BD=line$

From $\Delta CDB$

$\angle B={30}^o$

$\angle D={20}^o$

$DB=line$

$\angle D\cong \angle B$

$\angle B\cong \angle D$

$BD=DB$

$\therefore \Delta ABD\cong \Delta CDB$ is congurent i.e. ; ASA congurency is the criteria.