A hexagon has six sides and six angles.
a decagon
Triangle is plane with three sides and three angles. The sum of its inside angles is equal to 180 degrees.
None. A figure must have more sides than angles.
hendecagon
An octagon.
A triangle.
A triangle
A triangle has 3 sides and 3 interior angles that add up to 180 degrees.
If you mean EQUAL sides and angles, than an equilateral triangle.
It is a quadrilateral
square