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Answer:
(2) angle 1 + angle 2
Step-by-step explanation:
According to exterior angle property, the exterior angle of a triangle is equal to the sum of two opposite interior angles of the triangle.
Here, in the given Question angle 4 is exterior angle to the triangle and two opposite angles are angle 1 and angle 2.
So, angle 4 = Angle 1 + angle 2.
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