Geometry

Question Analysis
This question involves deriving the contrapositive of a statement about equilateral triangles.

Key Concept Explanation:
The contrapositive of "If P, then Q" is "If not Q, then not P."

Step-by-Step Solution:
Original statement: "If a triangle is equilateral (P), then all its angles are 60 degrees (Q)."
Contrapositive: "If not all angles of a triangle are 60 degrees (not Q), then it is not equilateral (not P)."
The correct answer is C.

Option Analysis:
A: This is the inverse, not the contrapositive.
B: This is the converse, not the contrapositive.
C: Correct contrapositive.
D: This is a specif...