Question

Which of the following staements must be true about this diagram check all that apply

Answer 1

Answer: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.