Geometry

Question Analysis:
This question uses a known angle measure to solve for a variable.
The main focus is angle properties of a square.

Key Concept Explanation:
Each angle in a square is 90°.

Step-by-Step Solution:
4x - 30 = 90
→ 4x = 120
→ x = 30

Common Mistakes:
Forgetting square angles are all 90°
Confusing with ...