- A18 cm
- B4.5 cm
- CCannot be found
- D9 cm
Step-by-Step Solution
∠A lies between AB and AC, and ∠D between DE and DF, so △ABC ≅ △DEF by SAS. By CPCT, EF = BC = 9 cm.
Answer: D) 9 cm
In △ABC and △DEF, AB = DE, ∠A = ∠D and AC = DF, as marked. If BC = 9 cm, how long is EF?
Class 9SAS, ASA and AAS CongruenceGeometry — Triangles
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