9. 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 \(AC\), \(∠B = x +\) 8. \(∠E =\) 51\(°\). 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 meaning congruence conditions are: