1. Point
1.1. it is the smallest geometry shape
1.2. it has no width and it has no length
1.3. it is represented as a dot
2. Line segment
2.1. it has two end points
2.2. it has a finite length
3. Ray
3.1. extends in one direction
3.2. has one end point
4. Line
4.1. extends in both direction
4.2. has no end points
5. Open and closed figures
5.1. polygon
5.1.1. triangle
5.1.1.1. 3 sided shape
5.1.1.2. 3 vertices
5.1.2. quadrilateral
5.1.2.1. square
5.1.2.1.1. 4 equal sided shape
5.1.2.2. rectangle
5.1.2.2.1. 4 sided shape
5.1.2.2.2. opposite side are parallel
5.1.2.3. rhombus
5.1.2.3.1. 4 equal sided shape
5.1.3. pentagon
5.1.3.1. 5 sided shape
5.1.4. hexagon
5.1.4.1. 6 sided shape
5.1.5. heptagon
5.1.5.1. 7 sided shape
5.1.6. octagon
5.1.6.1. 8 sided shape
5.1.7. nonagon
5.1.7.1. 9 sided shape
5.1.8. decagon
5.1.8.1. 10 sided shape
6. Parts of circle
6.1. circumference
6.1.1. border of circle
6.2. centre
6.2.1. is only one
6.3. radius
6.3.1. it does not cross the centre and touches the circumference
6.4. diameter
6.4.1. crosses the centre and is a chord with a special name
6.5. chord
6.5.1. that does not touches the centre but touches the circumference
7. Geometry
7.1. Point
7.1.1. it is the smallest geometry shape
7.1.2. it has no width and it has no length
7.1.3. it is represented as a dot
7.2. Line segment
7.2.1. it has two end points
7.2.2. it has a finite length
7.3. Ray
7.3.1. extends in one direction
7.3.2. has one end point
7.4. Line
7.4.1. extends in both direction
7.4.2. has no end points
7.5. Open and closed figures
7.5.1. polygon
7.5.1.1. triangle
7.5.1.1.1. 3 sided shape
7.5.1.1.2. 3 vertices
7.5.1.2. quadrilateral
7.5.1.2.1. square
7.5.1.2.2. rectangle
7.5.1.2.3. rhombus
7.5.1.3. pentagon
7.5.1.3.1. 5 sided shape
7.5.1.4. hexagon
7.5.1.4.1. 6 sided shape
7.5.1.5. heptagon
7.5.1.5.1. 7 sided shape
7.5.1.6. octagon
7.5.1.6.1. 8 sided shape
7.5.1.7. nonagon
7.5.1.7.1. 9 sided shape
7.5.1.8. decagon
7.5.1.8.1. 10 sided shape
7.6. Parts of circle
7.6.1. circumference
7.6.1.1. border of circle
7.6.2. centre
7.6.2.1. is only one
7.6.3. radius
7.6.3.1. it does not cross the centre and touches the circumference
7.6.4. diameter
7.6.4.1. crosses the centre and is a chord with a special name
7.6.5. chord
7.6.5.1. that does not touches the centre but touches the circumference