Geometry

Question Analysis
This question involves determining whether a given statement is a valid biconditional statement.
The main focus is on verifying the logical validity of both parts of the statement.

Key Concept Explanation:
A biconditional statement requires both the original statement and its converse to be true.

Step-by-Step Solution:
The statement is: "A triangle is equilateral if and only if all its angles are 60 degrees."
Break it into two parts:
If a triangle is equilateral, then all its angles are 60 degrees. (True)
If all angles of a triangle ...