Yr7 Unit 7 Week 1 Lesson 2

• Mathematics
• Lower Secondary (Key Stage 3)

Yr7 Unit 7 Week 1 Lesson 2

Starter 

Simplify the following ratios 

          

10 : 50

2 : 22

6 : 15

20 : 100

14 : 35 

24 : 64 

15 : 60

55 : 100

Starter 

Simplify the following ratios 

          

10 : 50

2 : 22

6 : 15

20 : 100

1 : 5

1 : 11

2 : 5

1 : 5

14 : 35 

24 : 64 

15 : 60

55 : 100

Starter 

Simplify the following ratios 

          

10 : 50

2 : 22

6 : 15

20 : 100

1 : 5

1 : 11

2 : 5

1 : 5

14 : 35 

2 : 7

24 : 64 

15 : 60

1 : 4

55 : 100

11 : 20

3 : 8 

Describe what is a protractor

Measuring Angles With A Protractor

A protractor is a simple device which is traditionally in a shape of a semi circular disc and can measure any angle between 0 and 180 degrees.

Measuring Angles With A Protractor

In order to make it easier to use, it contains two scales. One reads angles with respect to a clockwise direction. The other scale reads with respect to an anticlockwise direction.

Starter 

Simplify the following ratios 

          

2 : 14

4 : 20

9 : 15

40 : 100

18 : 45 

30 : 90 

36 : 12

100 : 25

Starter 

Simplify the following ratios 

          

2 : 14

4 : 20

9 : 15

40 : 100

1 : 7

1 : 5

3 : 5

2 : 5

18 : 45 

30 : 90 

36 : 12

100 : 25

Starter 

Simplify the following ratios 

          

2 : 14

4 : 20

9 : 15

40 : 100

1 : 7

1 : 5

3 : 5

2 : 5

18 : 45 

2 : 5

30 : 90 

36 : 12

3 : 1

100 : 25

4 : 1

1 : 3

How To Measure An Angle Using A Protractor

The following key points to measuring this angle are:

How To Measure An Angle Using A Protractor

The following key points to measuring this angle are:

•  Place the centre of protractor at the point  

   where the two lines join together

How To Measure An Angle Using A Protractor

The following key points to measuring this angle are:

•  Place the centre of protractor at the point  

   where the two lines join together

•  Place the zero line on one of the lines  

   making the angle

How To Measure An Angle Using A Protractor

The following key points to measuring this angle are:

•  Place the centre of protractor at the point  

   where the two lines join together

•  Place the zero line on one of the lines  

   making the angle

•  Use the inner scale and read where the   

   second line meets the scale

Example 1

•  Place the centre of protractor at the point  

   where the two lines join together

•  Place the zero line on one of the lines  

   making the angle

•  Use the outer scale and read where the   

   second line meets the scale

Example 1

 . Place the centre of protractor at the point  

   where the two lines join together

•  Place the zero line on one of the lines  

   making the angle

•  Use the outer scale and read where the   

   second line meets the scale

                120 degrees anticlockwise

Example 2

.  Place the centre of protractor at the point  

   where the two lines join together

•  Place the zero line on one of the lines  

   making the angle

•  Use the inner scale and read where the   

   second line meets the scale

Example 2

.  Place the centre of protractor at the point  

   where the two lines join together

•  Place the zero line on one of the lines  

   making the angle

•  Use the inner scale and read where the   

   second line meets the scale

                    80 degrees clockwise

Do You Understand how to use a protractor to measure an angle?

I understand the method used to measure an angle including using the correct scale.

I know how to set up the protractor but do not know which scale to use.

I am not sure what is clockwise and what is anticlockwise

I am not sure how to read the different scales

I do not know how to get started.