What information is necessary to prove the triangles congruent by SAS?

SAS requires two congruent sides and the included angle be also congruent

Given is the picture are congruent triangles

ΔACB ≅ ΔECD, because:

2

step-by-step explanation:

1+1=2

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°