12. Find the unknown value and select the meaningful congruence

$\mathrm{\Delta }$$ABC$ $\cong$ $\mathrm{\Delta }$$DEF$ by ASA congruence condition with $BC = EF$ and if  $AB$ is perpendicular to $AC$, $∠B = x +$ 14. $∠E =$ 70$°$. Solve and find the value of $x$ and hence select the congruent conditions.

 

 

1. The value of $x$ is .

 

2. The measure of angle $∠F =$ .

 

3. The meaningful congruence conditions are: