TTO1 CH1 ls1: lines, lines of vision, right angles, perpendicular and parallel lines

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 1

TTO1 CH1 lines, lines of vision, right angles, perpendicular and parallel lines

Start assignment

Get your Ipad (closed on the corner of your desk), notebook, pencil case, protractor triangle & compass

1) Join the lessonup

2) Make the excersise in your notebook: 

Draw a...

a) ...rectangle

b) ...square

c) ...circle

Program:

Today I'll learn... 

...what the difference is between lines, rays and line segments

...how to use a line of vision

...recognising right angles

...recognising parallel and perpendicular lines

• Start assignment (5 minutes)
• Introduction chapter 1 (5 minutes)
• Instruction (10 minutes)
• Bettermarks (15 minutes)
• Working on your glossary (10 minutes)
• Evaluation (5 minutes)

Introduction chapter 1

--> bettermarks introduction

Instruction (1)

1. Point: labeled with capital letter
2. Line segment: shortest path between two points. It has two endpoints.
3. Ray (or half line): a line with one endpoint
4. Line: no endpoints.  You can extend both ends to infinity

This is a...

1. line segment
2. line
3. ray

This is a...

1. line segment
2. line
3. ray

this is a...

1. line segment
2. line
3. ray

A line segment ...

1. has no beginning and no end
2. has a beginning
3. has an end
4. has a beginning and an end

Which word applies to the following definition :

A line with only one begin point and no end point

1. Edge
2. Line segment
3. Line
4. Half line

Instruction (2)

• A ⁣line of vision⁣ is a ⁣ray⁣ drawn from the point of view of a person.
• If we want to know if a person is able to see a certain object, we draw a line of vision from this person to that object. If the line is not hindered by obstacles, the person can see the object.
• Range of view: how many beach chair can this person see?

How many trees is this person able to see?

1. 1
2. 2
3. 3
4. 4

Instruction (3)

A right angle is ⁣90 °⁣ (pronounced ⁣“90 ⁣degrees”). The symbol for a right angle is a small square drawn inside the angle:

Recognise a right angle

you can the square of your protractor triangle to recognise a right angle

How many degrees is a right angle ?

1. 60 degrees
2. 120 degrees
3. 90 degrees
4. 45 degrees

Where do you see a right angle?

1. 
2. 
3. 
4. 

Instruction (4)

Parallel & Perpendicular:

1. Parallel: lines keep the same distance from each other at all points, lines never intersect
2. Perpendicular: Two lines (or rays or segments) are ⁣perpendicular⁣ to each other if they form a ⁣right angle.
   

Instruction (5): Draw perpendicular & parallel lines

ppt

Bettermarks

Make: 1.1, 1.2, 1.3, 1.4

Done? 

You can choose:

- Homework other subject

- Play Cross Math on your ipad (next monday we'll check: who have the most points?)

Glossary

Words you have to know:

• Line
• line segment
• ray
• Line of vision
• Right angle
• Parallel
• perpendicular

Think

Can you explain all of these words?

Pair

Discuss in pairs: check your definitions of the words with each other

Share

Think, pair, share

Evaluation

Homework before monday:

Make: 1.1, 1.2, 1.3, 1.4

Exitticket:

Write down and make a drawing:

a) Line

b) Line segment

c) Ray (half line)

Today I'll learn... 

...what the difference is between lines, rays and line segments

...how to use a line of vision

...recognising right angles

...recognising parallel and perpendicular lines

For example: you want to repaper the walls of your room, you calculate you need 5.2 rolls of wallpaper. In this case you havo to round up to 6 rolls of wallpaper, otherwise you wouldn't be able to finish you entire room.