Scale Drawing

What is Scale Drawing? When an object is too big to fit on a page we need to draw it to scale. To do this we need to measure the object and then divide all measurements by the same number to keep our diagram in scale.

Learning Intention: We are learning to reduce and enlarge shapes and objects for accurate image creation. We are learning to recognise map scales.

Success Criteria We will produce accurate images to scale using pencil & paper and RMLogo. We will make a scale model of a volcano. We will understand the use of scale on a map and correctly find real distances shown.

Example: In real life the average height of a door is 2m. Our page measures about 30cm therefore we cannot draw the whole door in real size on our page. We measure the height of the door and the width of the door. We divide the height and width by the same amount.

Height of door = 2m which is 200cm Width of door = 70cm Divide each measurement by 10. Height of door = 20cm Width of door = 7cm Now the image will fit on your page.

Let’s draw some objects to scale You will need: Ruler or metre stick Pencil Maths book Begin with these objects Your desk Your chair Teacher’s desk Remember to show all your working out. Think about the mathematical language you will use when explaining how you approached your task. Now choose 2 more items and draw to scale.

Scale Model Volcano Model Measure the height of your model volcano Find the height of Mount Vesuvius What is the scale of your model to Vesuvius? Remember to show your working out. Think about the mathematical language you will use when you explain your work.

Scale Drawing Have a look at the exercise on scale drawing in SPMG 4 Remember to show your working out. Think about the mathematical language you will use to explain your work.

Maps Let’s have a look at our atlas. Turn to the map of the world. What scale has been used to draw this map? Turn to the page which shows the map of Italy. What scale has been used to draw this map? Can you give a reason why the two maps have been drawn using a different scale? Remember to use mathematical language when giving your answer.

Maps to Scale Have a look at the exercise on maps drawn to scale in SPMG. Remember to show all your working out. Think about the mathematical language you will use to explain your work.

RM Logo Using RMLogo produce a scale drawing showing a birds eye of our classroom. You need to think about all you have learned so far about drawing to scale. Your image will have a lot of detail so you need to think carefully about the best approach to take before you start.

RM Logo You will need: Ruler / metre stick / trundle wheel Paper to record measurements Pencil Clipboard Step 1: Measure the length and width of the classroom. Step 2: Measure the length and width of each group of desks. Step 3: Measure the width of the IWB These are the items you will show in your scale drawing.

RM Logo Remember: As well as accurately recording the length and breadth of each item you will need to pay attention to any angles on each item.

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