Geometry

Question Analysis:
This question combines SSS with the Pythagorean theorem, testing deeper understanding of congruence in right triangles.

Key Concept Explanation:
For right triangles:
Two legs and the hypotenuse form three sides (SSS applies if all are congruent)
The hypotenuse can be calculated if both legs are known

Step-by-Step Solution:
Calculate AC and DF using Pythagorean theorem:
AC = √(AB² + BC²) = √(25 + 144) = 13 cm
DF = √(DE² + EF²) = √(25 + 144) = 13 cm
Now all sides match: AB = DE = 5, BC = EF = 12, AC = DF = 13
SSS can be applied despite initial missing hypotenuse

Option Analysis:
A: Incorrect - Hypotenuse must be...