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### Course: High school geometry>Unit 1

Lesson 6: Dilations

# Dilating triangles: find the error

Dilating doesn't just shrink or grow a figure. The scale factor also changes the distance from each point to the center of dilation. Created by Sal Khan.

## Want to join the conversation?

• So at 0.48, shouldn't it be 1/2, rather than 3/2? Forgive me if I am wrong.
• yes, I believe it should be 1/2
• Can someone tell me what FAQ means? Its just popping up every where and I feel like it's an omen from Zeus or some other god or whatever.
• At the end of the video, sal said that only choice C is correct in this question! but what happen to "select all that apply"? wouldn't choice A be correct too? (they have the same scale factor) Why is choice A incorrect?
• While the triangle in A does appear to have been rescaled by the same factor, the distances between each point and P have not been. To dilate a shape is to multiply the distance from each point to the center of dilation by the scale factor, which often means that the figure moves, and doesn't simply resize.
• wait did he not say last video that you need to center the triangle to the center of p
• Are there more accurate ways to calculate dilations? Using angles and lengths and their precise measurements?
• would the answer be c?
• yes😎
• why do we dialate
• We dialate to combine like terms.
• You cant draw on the thing !
(1 vote)
• Click the button that looks like a pencil on pad.
(1 vote)
• Thanks, but why do we even need this for real life? (I'm not going to become an engineer or anything!)
(1 vote)
• Can we exactly (mathematically) calculate which ones are correct? Why or why not?