Geometry

Question Analysis:
This question involves adjacent angle relationships in a rhombus.
The main focus is using supplementary angles.

Key Concept Explanation:
In a rhombus, adjacent angles are supplementary: angle P + angle Q = 180°.

Step-by-Step Solution:
(2x + 10) + (x + 80) = 180
→ 3x + 90 = 180
→ 3x = 90
→ x = 30

Common Mistakes:
Assuming an...