• Choice K
    4. In the figure below, ∠QPR measures 40°, ∠PQR measures 105°, and points Q, R, and S are collinear. What is the measure of ∠PRS ?

    The Exterior Angle Theorem states that, for a triangle:

    • The exterior angle d equals the angles a plus b
    • The exterior angle d is greater than angle a, or angle b.

    Therefore, ∠PRS = 40° + 105° = 145°

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