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# Identifying values in scale copies

Sal identifies missing side lengths in scale drawings.

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• It sounds like he didn't answer the problems and it's really confusing. Someone help please?
• one point which he did not stress and in the meanwhile it was really important is that after recognizing the length of the figures, we should see how much that side of the figure increases to the another side of the other figure. For example; AB has the length of BC in the figure B however the AB side value is 2 and BC in the figure B is 4 we can see that AB is twice smaller than BC and more importantly -- when the question asks the scale factor from figure A to figure B is, you should always consider the numerator as 1 and the denominator as the value of the scale. like 1/3
• how do you get mastery in one subject?
• You can get mastery on a subject by taking the unit test on the skill.
• Nani?How do I find to multpule figures with just two scale factors?
• nah just see how much the scale of a figure is bigger than another!
• I do not know how it is equal to two, he does not explain well.
• The ratio of figure A to figure B is 1:2 1/2. What that means is for every one unit in figure A, there is 2 1/2 units in figure B. Since figure B is 5, how many 2 1/2's do we need to get to the number 5? Then we get our answer for figure A. Because 2 1/2x2 is five, then we know our answer is 2. I hope this helps!
(1 vote)
• Im so confused. Would someone please explain? Help is greatly appreciated. Thank you!
• scale of Figure A:scale of Figure B=one side of Figure A:the same side of Figure B

x:5=1:2 1/2
x:5=2:5
x=2

x:7.2=3:4
x:7.2=5.4:7.2
x=5.4
• This guy makes this very confusing, any suggestions on hoe to understand this.
• it's not as hard as the actual questions