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1 It's a perfectly rounded 2 dimensional shape

2 It can be easily constructed with a compass

3 Its perimeter is better known as its circumference

4 Its diameter spans its circumference cutting through its centre

5 Its radius is half of its diameter

6 It can be concentric with other circle sharing the same centre

7 Its circumference divided by its diameter is the value of pi

8 Its pi value has never been determined because pi is an irrational number

9 Its circumference is: 2*pi*radius or diameter*pi

10 Its area is: pi*radius squared

11 Its radius can be found by: circumference/2*pi

12 Its diameter can be found by: circumference/pi

13 Its circumference touches a straight line tangent at only one point

14 Its circumference is a full rotation of 360 degrees

15 Its circumference measured in parts are arcs

16 Its radius is the measure of an arc radian which about 57.3 degrees

17 It has lines of symmetry that are infinite

18 It has chords which are straight line spanning its circumference

19 It has sectors which is an area enclosed by an arc and 2 radii

20 It has segments which is an area enclosed by an arc and a chord

21 It has certain exterior and interior angular properties

22 Its best friend is the sphere because they have so much in common

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Q: What are facts about a circle and its properties?
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