A triangle.
A triangle
Triangle (assuming you were asking 'three sides').
A triangle cannot have two parallel sides. In order for a figure to be a triangle, it must be a closed figure with three sides and three angles. If two of the sides were parallel, there is no way the figure could be closed by only one other line.
A triangle.
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
A 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 cannot have two parallel sides. In order for a figure to be a triangle, it must be a closed figure with three sides and three angles. If two of the sides were parallel, there is no way the figure could be closed by only one other line.