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1 It's a perfectly rounded 2 dimensional shape

2 It can be easily constructed with a pair of compasses

3 Its perimeter is better known as its circumference

4 Its radius is half of its diameter

5 Its diameter spans its circumference cutting through its centre

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

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

8 Its pi value has never been finally determined because it's an irrational number

9 Its area is: pi*radius squared

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

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

12 Its diameter can be found can be found by: circumference/pi

13 Its circumference touches a tangent line 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 same circular length of an arc which is a radian

17 Its radian is about 57.3 degrees

18 Its lines of symmetry are infinite

19 It has chords which are straight lines spanning its circumference

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

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

22 Its shortest distance from its centre to its circumference is via its radius

23 It forms the base of a cone

24 It forms the parallel bases of a cylinder

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

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Wiki User

9y ago

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