Geometry

Question Analysis:
This involves using the angle properties of rhombuses.
Focus is on supplementary consecutive angles.

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

Step-by-Step Solution:
Set up the equation:
(2x + 10) + (4x − 10) = 180
→ 6x = 180
→ x = 30

Common Mistakes:
Using 90° instead of 180° for supplementary angles
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