Question

find the measure of the third exterior angle in this triangle. 120° 155° ?°

Explanation:

Step1: Use the exterior angle sum formula

The sum of exterior angles of a triangle is \(360^{\circ}\). Let the third exterior angle be \(x\).
So, \(120^{\circ}+155^{\circ}+x = 360^{\circ}\).

Step2: Solve for \(x\)

$$
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$$

Answer:

\(85^{\circ}\)