Geometry

Question Analysis:
This tests when a rhombus becomes a square through angle conditions.
The main focus is checking for a right angle in a rhombus.

Key Concept Explanation:
If a parallelogram has all sides equal → it's a rhombus.
If one angle = 90°, then it’s a square.

Step-by-Step Solution:
Set: 5x - 10 = 90
5x = 100
x = 20

Common Mistakes:
Thinking all angles must be 90° (in fac...