Identifying scale factors (Full video)

Khan Academy
Supporting grades: 7

Description: Sal looks at a figure and a scale copy of the figure to determine what scale factor was used to create the scale copy. So right over here, Figure B is a scaled copy of Figure A and what we wanna do is figure out what is the scale factor to go from Figure A to Figure B? 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 two and over here, it has length one, two, three, four, five, six. He used a scale factor less than one, alright, and then they say what could be the length of the side that corresponds to AD?

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