# Parts of a Circle

The Circle

1. It’s round
2. It’s a shape
3. It’s symmetrical
4. It’s 360 degrees
5. The outside of a circle (perimeter) is called the circumference
6. It is 2D
7. It has no corners
8. It always has a centre point
9. It has no angles
10. The diameter is always double the radius
11. The radius is always half the diameter
12. It can be any size
13. A circle has two faces
14. It can roll
15. Half a circle is called a semi-circle
16. A circle is part of the following 3D shapes: Sphere, Cylinder, Cone
17. A quarter of a circle is called a quadrant
18. You can measure the circumference with a string
19. A piece of the circumference is called an arc
20. The length of the circumference is the diameter multiplied by Pi (3.14)
21. A diameter is a straight line going straight through the centre point that touches the circumference twice
22. A radius is a straight line from the centre point to the circumference
23. A cord is a straight line that goes from one point of the circumference to another without touching the centre point
24. A sector is a wedge of the circle that touches the centre point, has 2 radii and an arc
25. All its 3D shapes can roll

## 3 thoughts on “Parts of a Circle”

1. Rachel says:

Here’s an other fact on the circle: All points on the edge of the circle are the same distance to the centre point.

2. S.C says:

A circle is the only one sided shape with an area
=^_^=

3. DANIEL says:

Poland
Czech REPUBLIC
Slovakia
Croatia
Ukraine
Lithuania
Latvia
Estonia