Geometry

Question Analysis:
This question requires using diagonal lengths to classify a parallelogram.
The main focus is identifying the condition for a rectangle.

Key Concept Explanation:
If the diagonals of a parallelogram are congruent, then it is a rectangle.

Step-by-Step Solution:
Set the diagonals equal:
2x + 5 = 3x - 10
Subtract 2x:
5 = x - 10
Add 10:
x = 15

Common Mistakes:
Assuming all...