Final answer:
The conditional statement 'If a polygon is an octagon, it has eight sides' is true. Every time we have an octagon, it will always have eight sides.
Step-by-step explanation:
A conditional statement is made up of two parts: the hypothesis (if-part) and the conclusion (then-part). In this case, the conditional is: If a polygon is an octagon, it has eight sides. To determine if the conditional is true, we need to check if every octagon has eight sides. Since an octagon is defined as a polygon with eight sides, the statement is true. Every time we have an octagon, it will always have eight sides. Therefore, there is no need to provide a counterexample in this case.