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

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:

yes

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step-by-step explanation: