Use the statement below and its converse to write a biconditional."If a polygon has exactly three sides, then it is a trianlge." a. A polygon is a triangle if and only if it has exactly three sides b. If a polygon is a triangle, then it has exactly three sides c. A polygon is not a triangle if and only if it does not have exactly three sides d. A polygon does not have exactly three sides if and only if it is a triangle