Suppose AB = 10 cm, BC = 9 cm, AC = 11 cm, DE = 11 cm, and DF = 9 cm. What else do you need to know to prove that the two triangles are congruent by SSS?

a.

EF = 9 cm

c.

EF = 10 cm

b.

EF = DE

d.

EF = DF

Verified Answer :

Two triangles must be congruent by SSS when their all sides would be equal.
So, BC = DF
AC = DE
Then, AB = EF = 10

In short, Your Answer would be Option B

Hope this helps!