The congruence required is:
a. The first postulate is the SAS congruence postulate. It states that:
The given pair of congruent parts are:
A pair of congruent sides is given and a pair of congruent angles is given.
From the postulate, the missing pair of congruent parts has to be a pair of congruent sides that will make the given pair of congruent angles included (sandwiched between the congruent sides).
Hence, the required pair of congruent sides is:
b. The second postulate is the ASA congruence postulate:
The given congruent parts are:
A pair of congruent angles and a pair of congruent sides are given. From the postulate, the missing pair has to be a pair of congruent angles that will make the given pair of sides included.
Hence, the required pair of congruent angles is:
c. The third postulate is the SSS congruence postulate:
The given congruent pairs are:
Since two pairs of congruent sides are given, from the postulate, the pair of the third side must be congruent.
Hence, the missing pair of congruent sides is:
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