Geometry

Question Analysis:
This question involves applying the Law of Detachment to the properties of an isosceles triangle.
The main focus is on understanding the relationship between an isosceles triangle and its sides.

Key Concept Explanation:
The Law of Detachment allows us to conclude that if a triangle is isosceles, then it has at least two equal sides.

Step-by-Step Solution:
The conditional statement is: "If a triangle is isosceles, then it has at least two equal sides."
The premise is: "Triangle DEF is isosceles."
By the Law of Detachment, the conclusion is: "Triangle DEF has at least two equal sides."

Option Analysis:
A) Incorrect. An isosceles triangle does not necessarily have three equal sides.
B) Correct. This follows directly from th...