What is the inverse of the following conditional statement? "If the sum of the interior angles of a polygon is 180°, then the polygon is a triangle." If the polygon is a triangle, then the sum of the interior angles of the polygon is 180°. If the polygon is not a triangle, then the sum of interior angles of the polygon is not 180°. If the sum of the interior angles of a polygon is not 180°, then the polygon is not a triangle. If the sum of the interior angles of a polygon is 180°, then the triangle is a polygon.