Question

Which congruency theorem can be used to prove
that ABD =DCA?

Answer 1

The answer is "SAS".

Explanation:

In this question we assume two angle is given that are:

`\ Two \ triangles \angle ABD \ and \angleDCA \\\\\ In \ this \ on \ angle \ is \ common \ that \ is, \\\\ AD=AD \\\\AB= CD \\\\\angle A \ is \ equal \ = \angle A \ (\ which \ is \ given)\\\\`

That's why SAS rule is correct.