cw Using Formal Notation This lesson Using letter

cw Using Formal Notation This lesson: Using letter notation to describe parts of shapes Next lesson: Comparing properties of shapes and making accurate drawings 10/01/2022 Keywords Formal Notation Point Line Segment Parallel Perpendicular Polygon Quadrilateral Triangle

Point P x What we do: Label with a single capital letter What we say: “Point P” Line Segment P x x Q What we do: Use the two points to describe the line What we say: “Line segment PQ”

Whiteboard Rules 1) Silent, individual activity 2) Everyone shows their board 3) “ 3… 2… 1… Show me”

On your boards, draw these points Whiteboard Rules A x 1) Silent, individual activity 2) Everyone shows their board 3) “ 3… 2… 1… Show me” C x Dx B x E x

Parallel E G 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

Perpendicular N K L 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

AB BE AC BC II| DE DF True or False? A False True D E B C F

True or False? AB BE BE CF CE II| EF False True D A E B C F

True or False? AB II EC A D B E True C How do we know without the arrows?

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

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)

Complete the tasks on the sheet Remember: Use your notes to help you

Copy and complete these three sentences A shape is a polygon if _______ If two lines are perpendicular if ______ An angle is ____________ Use the feedbac k wall to RAG 123 and keep you book OPEN