A circle with a circular hole

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Question from Sue:

My little one is wondering if a circle with a circular hole could be described as an irregular semicircle.
As it has 2 sides but is not the standard shape. Could you share your thoughts ??

Hi Sue,

I'm not sure what you mean by a circle with a circular hole. Perhaps one of these?

irregular semicircle

I any case if you are doing mathematics and you have a shape or concept that doesn't have a name, you can name it yourself. Other people have to agree that your name is a good one so that you can talk about it and everyone knows what you mean.

Tell your little mathematician to keep generating good ideas,
Penny

Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.