Circles is a chapter in 9th grade NCERT text books, taught across all CBSE schools. From the wheel, which is perhaps man’s most important innovations, to watches, we are surrounded with an immense number of circular objects. That brings us to what is a circle? what are the properties of a circle? So, if you are curious to know about the basics of two-dimensional closed figures called circles, you need to follow this presentation. This presentation is a simplified explanation of the chapter 8 “Circles” of Class IX NCERT Mathematics book followed by CBSE curriculum. Here, all the basic details and the properties of different aspects of circles have been provided as theorems with their mathematical proofs.

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