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Deducing Congruent Parts of Congruent Triangles

3. the follow...

Question

3. the following pairs of triangles are congruent . find the unknown lengths of the sides .
(a)

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Solution

step 1:- given:- $△ A C B ≅ △ D E F$
to find:- $E F$
step 2:- as, $△ A C B ≅ △ D E F$
$C B = E F (c p c t)$
$\Rightarrow E F = 5 c m$

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