A circle is a 2 dimensional shape; it has a length and a height (the same, essentially), but no width. Since a circle has no width (or "depth"), it cannot exist in real life (only drawn on paper). (Even if you cut out the circle drawn on the paper, it would still have the width of the paper as a dimension, which would make it not a circle, by definition.)
There are some "cylindrical" objects in real life (which have a length, height and depth, so are 3D) but these are not the same as "circles"(cylindrical objects are allowed to have a width/depth, but circles cannot by definition). Examples of cylindrical objects include sellotape reels, wheels and other objects that have 2 circular faces and a curved surface in between.
The similar to a circle is a sphere - a sphere is an object where if lots of cross sections were taken, the cross section would be circular. Examples are Oranges, flowers, tomatoes, apples and balls.
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A circle graph is a pie chart
a real life example of an octagon is a stop sign.
A pennant is a real life example of an isosceles triangle.
circular tunnel
It is equal to 2 r or D, where r= radius and D = diameter of the circle.