An arc (segment of a circle) has one straight side, and one curved side.
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A five sided 2 dimensional object is called a pentagon.
What is a 12 sided object called?A twelve sided object is called a dodecagon. I'm glad I could help. =)
'Object' Do you mean 'shape' or 'solid'. a 2-dimensional shape is an hexagon a 3-dimensional solid is a hexahedron.
A hendecagon.
it is called a pentadecagon ok? its like pentagon but its a pentadecagon.