Answer:
5. E, B, D
6. EB, BD, ED
9. BE
10. EBA, EBD, EBF
11. ABD
12. ABF
Step-by-step explanation:
5. The name of the triangle lists the vertices: E, B, D.
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6. The sides are named by pairs of vertices: EB, ED, BD.
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9. The common side of angle ABE and angle EBD is BE.
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10. Any of the remaining points can serve to identify an angle with BE as one side: ABE, DBE, FBE
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11. Angles 1 and 2 together form angle ABD.
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12. The three angles add to give the straight angle ABF.
