If a figure is not a triangle then it does not have three sides ,is the contrapositive of the statement given in the question.
Triangle
triangle
That is a triangle.
That is a triangle.
A polygon is formed by three or more sides. there is no specific figure.
A triangle.
A triangle
Polygons have multiple sides and angles.
square
Triangle (assuming you were asking 'three sides').
A triangle is a geometric figure that is made of three line segments. It is a closed figure and has three angles.