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Answer

Explanation
The formula for calculating the size of an exterior angle is
exterior angle of a polygon = 360 divided by number of sides

Answer:

Exterior Angle Theorem

Step-by-step explanation:

An exterior angle of a triangle is formed by any side of a triangle and the extension of its adjacent side. The Exterior Angle Theorem states that An exterior angle of a triangle is equal to the sum of the two opposite interior angles.