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What shapes aren't quadrilateral?
Most shapes. For example, triangles, pentagons, hexagons, heptagons, 8-gons, 9-gons etc; circles, ellipses, ovals and other random meandering curves.
Which prism has 20 faces and 54 edges?
A prism whose ends are 18-gons.
How many sides does a onehundredagon have?
None, because there is no such thing
Polygon with more than 15 sides?
There are names made up of standard prefixes and sufixes for polygons of virtually any numbers of sides. While octacontakaitetragon is the name of an 84 sided polygon and a triacontakaitrigon is a 33 sided polygon, it is customary and far more practical to call them 84-gons or 33-gons.
Which shape do not have lines of symmetry?
The vast majority of shapes. Common examples are scalene triangles, irregular quadrilaterals and n-gons of all number of sides. However, because they are irregular, their characteristics are more difficult to measure. Consequently many are not studied at school.
