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Which plane figure has eight sides?
A plane figure with eight sides is an octagon.
A closed plane figure with 3 or more sides?
If they are straight sides, then a polygon. Otherwise, simply "a closed plane figure with 3 or more sides".
A plain figure with eleven straight sides and angles?
Hendecagon
What is the name for an eleven-sided plane figure?
hendecagon Sandra Good
A plain figure with six sides?
I guess it is a dice or what else is it supposed to be? A hexagon is a plane figure with 6 sides.
Which plane figure has eight sides?
A plane figure with eight sides is an octagon.
Plane figure with 11 sides?
The best name seems to be hendecagon (from the Greek word for "eleven").See http://mathworld.wolfram.com/Hendecagon.html.
Is a quadrilateral any plane figure with four straight sides?
A quadrilateral is a closed plane figure with four straight sides.
A closed plane figure with 3 or more sides?
If they are straight sides, then a polygon. Otherwise, simply "a closed plane figure with 3 or more sides".
What is a plane figure for the triangle?
its self because a plane figure is a figure that is flat and has all strait sides.
Which plane figure has 8 sides?
An 8-sided plane figure is an octagon.
What is a plane figure with no sides?
circle
Which plane figure does not have 4 corners?
No plane figure has four vertices unless it has four sides.
A plain figure with eleven straight sides and angles?
Hendecagon
What does Hendecahedron mean?
It is a three-dimensional figure with eleven plane surfaces.
What is the name for an eleven-sided plane figure?
hendecagon Sandra Good
What plane figure has 6 sides and 6angles?
None. A figure must have more sides than angles.
