Respuesta :

marcthemathtutor

Answer:

40°

Step-by-step explanation:

if,

1) BC is the diameter and,

2) A is located on the circumference,

then by Thales' Theorem (see attached for reference),

3) m∠A is 90°

hence,

m∠C = 180° - m∠B - m∠A

= 180° - 50° - 90°

= 40°

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