Answer:
Triangle ABD and triangle ECD (A)
Explanation:
For two triangles to have a Side Angle Side Postulate, their corresponding sides and angle in the postulate must be equal.
To determine the pair of triangles that is congruent to the Side Angle Side Postulate let's check the options.
a) Triangle ABD and triangle ECD:
Looking at this two triangles, AB = EC
BD =CD
∠B = ∠D
Since the sides are and angle are equal, they are congruent
For the other options (b-d), you find that the corresponding sides of the two triangles and angle between them are not equal
b) Triangle ABC and triangle ECD
c) Triangle ABD and triangle ADC
d) Triangle ADC and triangle ABC