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### Course: Geometry (all content)>Unit 10

Lesson 9: Old transformations videos

# Determining translations (old)

An older video of Sal determining what translation was performed on a shape to result in another shape. Created by Sal Khan.

## Want to join the conversation?

• How can I get to the place where it asks me questions and I answer like in the video?
• That is the exercise section of the videos.. search the topic and click on the exercise one. (It has a star)
Almost every video has an exercise to go with it.
• So when you move to the left it's negative and when it's shifted to the right it's positive, right?
• That's right, the numberline is left negative, right positive
• This does not explain the question that I thoroughly request a exquisite answer for.
(1 vote)
• this video is probably given to you based on the topic you were searching for
(1 vote)
• The exercises changed ,didn't they?
(1 vote)
• Yes, they have. The graphics and interface are a lot less boring-looking and pleasing to the eye. Plus, the sounds played stimulate pride when you get a hard question correct.
(1 vote)
• What is a translation in terms of these alternative shapes ?
(1 vote)
• Well i need help home work . I dont understand trasformational geometry and similarity with triangle.
(1 vote)
• What set of reflections would carry triangle ABC onto itself?
(1 vote)
• I forgot what is the one type of transformation that will lead to similarty
(1 vote)
• i really still do not understand how to find out how much it has moved
(1 vote)
• I am okay at math, but I am better at logic and words. Do you think it would still be effective if I or anyone else could solve problems like this with logic?
(1 vote)
• Math is logical, especially when we get to the proofs. You must use logic to get through the math, but when we introduce rigorous methodology we run into issues. This where the symbols we use come in handy. You have thought through the question, but you need an accurate, succinct way to provide others your proof. In this case, mathematics becomes the language to describe what you thought. If you are good at logic, then you are well on your way to being good at math, the trick is helping you learn how to use the symbols to represent your thoughts.
(1 vote)

## Video transcript

PROBLEM: What was the translation applied to move the blue solid shape to the orange dashed shape? So if you were to start with this blue solid shape, and you wanted to shift it to where the orange dotted shape is, how would you do that? And the way that I like to think about it is to just pick a point, and see what had to happen to that point. So this point at the top of this – I guess – this quadrilateral-looking thing, it moved down here. So it moved one to the left. And it moved one down. So we can denote that with a transformation. Moving one to the left is negative one (-1) in the horizontal direction. If we were moving to the right, it would have been a positive one (+1). And we moved one down, in the vertical direction. And that is another negative one (-1).