Name: Dilating triangles: find the error
Uploaded: 2020-04-15T18:21:24.000Z
Duration: 2 min 41 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Basic passive voice

whose center is P and scale factor is 3/4.

A-prime, B-prime, C-prime using the solid line.

All right, now before I even look at the choices,

what would that dilation actually look like?

is now going to be 3/4 as far, but along the same line.

So if C was there, 3/2 would be this far.

If we have this line connecting B and P like this,

And then on this line, halfway is roughly there.

Which we can see is exactly what we see for choice C.

But let's just make sure we understand why

these other two choices were not correct.

So choice A, it looks like it is a dilation

Each of the dimensions, each of the sides

looks like it's about 3/4 of what it originally was.

But it doesn't look like the center of dilation is P.

like it is probably the midpoint of segment AC.

Because now it looks like everything is 3/4

So they have this other center of dilation in choice A.

it looks like they just got the scale factor wrong.

But this scale factor looks like it's much closer

So that's why we can rule that one out as well.

Subtitles ListPlay Video

Dilating triangles: find the error

figure

scale

solid

roughly