Respuesta :

Answer:

25 degrees

Step-by-step explanation:

So a triangles angels equal 180 degrees

So for angel ECD 180 - (15+90) = 75

Straight lines also always equal to 180 degrees so

180 - (80+75) = 25

Answer:

C: 180°-90°-15°= 75°

B: 180°-90°-80°= 10°

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