Geometry

Question Analysis:
This question tests understanding of how diagonals bisect each other in a parallelogram.
The main focus is using one half of a diagonal to find the full length.

Key Concept Explanation:
In any parallelogram, the diagonals bisect each other at the point where they intersect.

Step-by-Step Solution:
If BE = 9 cm, and BD is bisected at E,
Then ED = 9 cm, so BD = BE + ED = 9 + 9 = 18 cm

Option Analysis:
A. 9 cm – Half the diagonal only
B. ✅ 18 cm – Correct total length
C. 20 cm – That’s diagonal AC, not BD
D. Cannot be determ...