A quadrilateral - if the sides are straight lines.
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The sum of the measures of the angles in a figure having 9 sides is 20 degrees each angle.
Cjic
A triangle whose sides are curved outwards.
The figure which is always a rectangle is a SQUARE having four straight sides and four right angles.
If the sides are all equal, and opposite sides are parallel, then the angles are all equal (72º) and it is a 'regular hexagon'. A six sided plane figure is called a hexagon, as "hex" means "six."