In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure (known as theperimeter) or to the whole figure including its interior. However, in strict technical usage, "circle" refers to the perimeter while the interior of the circle is called a disk. The circumference of a circle is the perimeter of the circle (especially when referring to its length)
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soccer ball basketball
you can find them at banks and also at the shops
Can you use trigonomic functions in real life situations? It's not like you carry a calculator with you everywhere... Very unlikely unless you have a job that requires trig skills.
its critical. without circles our life will become miserable