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Current time:0:00Total duration:2:18

Creating scale drawings

Video transcript

sue is a software engineer she wants to create a large scale drawing of a processor inside a cell phone the processor is a square chip nine millimeters on each side draw the processor such that one unit on the grid below represents one half of a millimeter all right so let's just think about these two worlds you have the drawing and you have the chip in the real world the drawing we're thinking in terms of these units here on this graph paper so units and the chip we're thinking in terms of millimeters and so we can set up a table here and they tell us draw it such that one unit represents half a millimeter so one unit would represent one half of a millimeter they tell us that the processor is nine millimeters on each side so that is how many times as many millimeters well to go from one half to nine you have to multiply by 18 so that's going to be 18 times as many units as well so if I want to do a scale drawing right over here it's going to be a square it's a square chip and since the scale is one unit it represents half a millimeter 18 units would represent nine millimeters and so I would want to do 18 units on a side so 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 so that would be the left side of the chip let me just see if I can draw a straight line there just like that and then it would also be 18 wide 18 units wide representing 9 millimeters in the real world 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 this is making my eyes hurt all right so just like that and then I could draw the other parts of it it would be like that and then I would just go straight down like that and there you have it I have drawn a scale drawing of our processor and we are all done