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Current time:0:00Total duration:1:26

Identifying scale factor in drawings

Video transcript

so right over here figure B is a scaled copy of figure a and what we want to do is figure out what is the scale factor to go from figure a to figure B pause the video and see if you can figure that out well all we have to do is look at corresponding sides and think about how much they have been scaled by so for example this side right over here would correspond to this side right over here on Figure B and over here it had length 2 and over here it has length 1 2 3 4 5 6 so it looks like that side has been scaled up by a factor of 3 and so if this and figure B truly is a scaled copy then every side should be scaled up by a factor of 3 and we could verify that we don't do it with every side we're being told that these are scaled copies but we can see that this is the case for example this side right over here corresponds to this base right over here this has length 3 so if we're scaling up by a factor of 3 we should multiply that by 3 and this should be of length 9 let's see if that's the case 1 2 3 4 5 6 7 8 and 9 and so you can see we can feel pretty good that Figure B is a scaled copy of figure a and that scaling factor is 3