1. cw Using Formal Notation 22/07/2019 Keywords
Formal Notation Point Line Segment
Parallel Perpendicular
Polygon
Quadrilateral
Triangle
This lesson: Using letter notation to describe parts of shapes
Next lesson: Comparing properties of shapes and making accurate drawings
Dates, titles and keywords.

2. Point Line Segment x P What we do: Label with a single capital letter
What we say: “Point P”
Line Segment x x Q
Talk through of definitions, students to make notes in their books as on the slide.
Emphasis on points and lines definitions as well as notation.
Point: Euclid ‘that which has no part’ Line: Euclid ‘a length without breadth’
Animations to aid teachers to walk around the room and check rulers being used etc. P
What we do: Use the two points to describe the line
What we say: “Line segment PQ”

3. Silent, individual activity Everyone shows their board
Whiteboard Rules
Silent, individual activity
Everyone shows their board
“3… 2… 1… Show me”
Setting expectations for whiteboard work

4. On your boards, draw these pointsx x
Whiteboard Rules
Silent, individual activity
Everyone shows their board
“3… 2… 1… Show me” A C x D x x B
Quick whole class check for understanding.
Particular points to highlight: Order of letters will still give you the same line even though you’ve drawn it differently, e.g. “Draw line segment AE”, “Draw line segment EA” Other letters might lie on the same line, e.g., “Draw line segment BC”
Possible extension questions: “What three line segments would give me a triangle?”, “What polygon would I get if I joined all the points together alphabetically?”, “Could I join every point to make a different polygon?” E

5. If two lines are parallel, they do not meetG D F
If two lines are parallel, they do not meet
What we do: We put arrows on lines that are parallel
What we write: DE II FG
Talk through of definitions.
Parallel/Perpendicular/Angle/Polygon to be printed to a sheet to stick in other than taking notes.

6. If two lines are perpendicular, they meet at right anglesK M
If two lines are perpendicular, they meet at right angles
What we do: We use a small square to show the right angle
What we write: KL | MN
Talk through of definitions.
Parallel/Perpendicular/Angle/Polygon to be printed to a sheet to stick in other than taking notes.

7. True or False? AB | BE AC II DF BC II DE False True True A D E B F C
Quick whole class check for understanding using true/false pages in planners.
Address any mistakes. F C

8. True or False? AB | BE BE II CF CE II EF True False True D A E B F C
Quick whole class check for understanding using true/false pages in planners.
Address any mistakes. F C

9. How do we know without the arrows?
True or False?
AB II EC
True A D E B
Quick whole class check for understanding using true/false pages in planners.
Address any mistakes.
This question would be good for a quick paired discussion before moving on. C
How do we know without the arrows?

10. An angle is a turn from one line to another
Angles Z X Y
An angle is a turn from one line to another
What we do: Show the angle with a curved line
What we write: ∠ZYX
Talk through of definitions.
Parallel/Perpendicular/Angle/Polygon to be printed to a sheet to stick in other than taking notes.

11. A polygon is a closed 2 dimensional shape made up of straight lines
Polygons Z X Y
A polygon is a closed 2 dimensional shape made up of straight lines
What we do: Use the points to describe the vertices of the polygon
What we write: Triangle XYZ (we might have other polygons, such as quadrilaterals or pentagons)
Talk through of definitions.
Parallel/Perpendicular/Angle/Polygon to be printed to a sheet to stick in other than taking notes.

12. Complete the tasks on the sheet Remember: Use your notes to help you
Main task. Instructions are on the sheet and the document is linked

13. Use the feedback wall to RAG123 and keep you book OPEN
Copy and complete these three sentences
A shape is a polygon if ______________
If two lines are perpendicular if ______
An angle is _______________________
This is to assess understanding of key vocabulary ready for the next lessons on classifying and drawing triangle and quadrilaterals.
Use the feedback wall to RAG123 and keep you book OPEN