Find the unknown value and select the meaningful congruence — task. Mathematics State Board, Class 7.

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$Δ$

$ABC$

$≅$

$Δ$

$DEF$ 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:

$1$

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12. Find the unknown value and select the meaningful congruence