Geometry

Question Analysis:
This problem applies the consecutive angle property, requiring students to recognize supplementary angle relationships.

Key Concept Explanation:
In parallelograms:
Consecutive angles are supplementary (sum to 180°)
Opposite angles are equal
Angle W + angle X = 180°

Step-by-Step Solution:
Given angle W = 60°
Since W and X are consecutive angles: 60° + angle X = 180°
angle X = 180° - 60° = 120°

Common Mistakes:
Assuming opposite angles are supplementary
Subtracting from 90° instead of 180°
Forgetting which angles are consecu...