Geometry

Answer: A

Explanation:

The original statement: If a triangle is equilateral, then all of its angles measure 60 degrees. ✅ (True)
The converse: If all of a triangle’s angles measure 60 degrees, then it is equilateral. ✅ (True)
Since both statements are true, they form a biconditional: "A triangle is equilateral if and only if all of its angles measure 60 degrees."

Analysis of Incorrect Options:

Option B: The original statement is true, but the converse "If a quadrilat...