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Which of the following statements must be true?select all that apply.

Answer:
Answer: options B, C, E will be correct according to the given diagram.
Explanation:
Since, according to the Exterior Angle theorem, In a triangle the sum of any two adjacent interior angles is equal to the exterior angle of the triangle.
And, here is the exterior angle of the triangle, while , , and are the interior angles of the triangle.
Thus, according to the theorem,
.
⇒
and
Therefore, options B, C, E are correct.
Step-by-step explanation: