yego.me
💡 Stop wasting time. Read Youtube instead of watch. Download Chrome Extension

Identifying scale factor in drawings | Geometry | 7th grade | Khan Academy


less than 1m read
·Nov 11, 2024

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. Over here, it had length two, and over here it has length one, two, three, four, five, six. So it looks like that side has been scaled up by a factor of three.

And so if figure B truly is a scaled copy, then every side should be scaled up by a factor of three, and we could verify that. We don't have to 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 three, so if we're scaling up by a factor of three, we should multiply that by three, and this should be of length nine.

Let's see if that's the case. One, two, three, four, five, six, seven, eight, and nine. 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 three.

More Articles

View All
5 Mistakes that RUIN your Credit Score
Once of you guys, it’s Graham here. So I’ve said it before and I’ve said it again, but building your credit is probably one of the most important things that you can do to improve your financial future. Not only can having a good credit score get the lowe…
You Are Two
Your brain is two brains. Two hemispheres, each doing half the work of being you. Half your vision goes to each, and half your movement directed by each. Right controls left, and left controls right. Your two brains coordinate through a wire of nerves, bu…
Exploitation: A problematic pejorative
When people use the word “exploitation” in the context of sweatshops, I think they want the word to express a negative judgment. I think that most of the people using the word in this way haven’t thought things through clearly. The greedy capitalist make…
Paying for college | Careers and education | Financial Literacy | Khan Academy
I think most people realize that college isn’t necessarily a cheap proposition, so it’s important to think about how you can pay for college. I think in many cases folks might be surprised that college can be more affordable than expected. I remember whe…
What I Wish I Knew When I Was Younger
Welcome to beautiful Vancouver, British Columbia. This is actually where I grew up, just across that water. And I remember when I was a teenager here I wanted to be a film maker. And so what did I do? Well, I found a film director with a strange name who …
Multivariable chain rule and directional derivatives
So in the last video, I introduced the vector form of the multivariable chain rule. Just to remind ourselves, I’m saying you have some kind of function f, and in this case, I said it comes from a 100-dimensional space. You might imagine, well, I can’t im…