Respuesta :

sqdancefan

9514 1404 393

Answer:

  (c)  ∠ECF and ∠BCF

Step-by-step explanation:

Complementary angles total 90°. Here, 90° angle BCE is divided by ray CF into two complementary angles. They necessarily have a total of 90°.

  ∠ECF and ∠BCF

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