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the empty figure
A 5 sided figure is called a: pentagon
That depends on the figure whose surface area and volume you're finding. You could try a Google search for "volume of [figure name]" or "surface area of [figure name]".
A hexagon.
a hexagon
A sphere.
opposite rays have common end points
anticline and syncline
Cristae
An oxymoron is a figure of speech in which apparently contradictory terms appear in conjunction. An anagram is a word, phrase, or name formed by rearranging the letters of another, such as cinema, formed from iceman.
compact, foldup, camping, foldaway, hinged
Mrs. Ori Gami.
There is no specific name in general. If the line segments are straight, then it is a triangle.
Origami is the Japanese art of folded paper.
the empty figure
The name of the shapes formed are triangles.
The name of a four sided figure (or shape) is called a Square. :)