# 2. By applying SAS congruence rule, you want to establish that  $\bigtriangleup PQR\cong \bigtriangleup FED$. It is given that $PQ= FE$ and $RP= DF$. What additional information is needed to establish the congruence?

To prove congruency by SAS rule, we need to equate two corresponding sides and one corresponding angle,

so in   proving $\bigtriangleup PQR\cong \bigtriangleup FED$ we need,

$PQ= FE$

$RP= DF$

And

$\angle P = \angle F$.

Hence the extra information we need is $\angle P = \angle F$.

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