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2 answers:
Answer:
5. Congruent triangles
Step-by-step explanation:
Congruent Triangles : When two triangles are congruent, all its three sides are equal and have the same angles.
So in conguent traingles,
ΔADB ≅ BDC
Therefore, AB = DC and AD = BC
Thus this completes the missing information that proves that the quadrilateral ABCD ia a parallelogram, then its opposite sides are congruent.
Answer:
congruent triangles
Step-by-step explanation:
The complete reason is, "corresponding parts of congruent triangles are congruent." This reason is sometimes abbreviated CPCTC.
It can be helpful to note that the previous step concluded that the relevant triangles are congruent .
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