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Geometry, NAP-J4-CA25

Spiro is making a scale drawing of his house.

  • The height of the garage in the scale model is 6 centimetres.
  • The height of Spiro's actual garage is 3 metres.

What does 1 centimetre in Spiro's scale drawing represent in his real house?

`text(1800 cm)` `text(200 cm)` `text(100 cm)` `text(50 cm)`
 
 
 
 
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`text(50 cm)`

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`text(6 cm)` `= 3\ text(m)`
  `= 300\ text(cm)`
`:. 1\ text(cm)` `= 300 -: 6`
  `= 50\ text(cm)`

Geometry, NAP-D4-CA13

Libby plays on a hockey field that is 120 metres long.

She makes a scale diagram of the field using a ratio of  1 : 400.
 

How long should Libby make the scale diagram of the field?

`text(3 cm)` `text(30 cm)` `text(90 cm)` `text(300 cm)`
 
 
 
 
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`text(30 cm)`

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`text(Ratio is)\ \ 1:400`

`text(S)text(ince 120 m = 12 000 cm,)`

`text(Length of the scale diagram)`

`=12\ 000 ÷ 400`

`= 30\ text(cm)`

Geometry, NAP-C4-NC11

Danny was eating dinner and after finishing he took a photo of his plate and fork.
 

 
Which of the following measurements is closest to the length of the fork?

`9\ text(cm)` `10\ text(cm)` `12\ text(cm)` `15\ text(cm)`
 
 
 
 
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`text(15 cm)`

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`text(The fork is approximately 75% the height)`

`text(of the plate,)`

`:.\ text(Fork height)` `= 75 text(%) xx 20`
  `=15\ text(cm)`

Geometry, NAP-C4-NC07

The picture below shows a flower.
 

 
The picture is 2 cm wide. The actual flower is 40 cm wide.

What scale is used in the picture?

 
 1 cm represents 80 cm
 
 4 cm represents 20 cm
 
 1 cm represents 20 cm
 
 1 cm represents 2 cm
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`text(1 cm represents 20 cm)`

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`text(1 cm represents 20 cm)`