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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