00:01
Okay, so for the first, it says for 18 through 21, write a rule for each glide reflection that maps triangle d -e -f to triangle d -e -f prime.
00:13
So d is at 7 -2, e is at 3 -9, so 3 -9, and then 9.
00:31
And f is at 8 .6.
00:35
So 8 .6.
00:39
F.
00:40
E.
00:47
Okay.
00:47
And then we have d at negative 5 .1.
00:53
So negative 5 .1 is d prime.
00:58
E prime is at negative 1, negative 12.
01:03
Ooh, it wasn't prepared for that.
01:07
E prime.
01:08
And then f prime is at negative 6 .5 .5 .0 .0 .0 .0.
01:10
And then f prime is at negative 6, 9.
01:12
Negative 6, positive 9.
01:16
Oh, oops, negative 1, 12 is up here, e prime.
01:23
And then negative 6, 9.
01:26
So, negative 6, 9 is right here.
01:40
Okay.
01:41
So obviously, this is a reflection.
01:45
And i'm going to count one, two, three, four, four.
01:51
So it's a reflection across x plus one.
01:58
So reflection across x equals one.
02:05
And then translated x minus, oops, no, x plus or x comma y plus plus plus one, two, three.
02:29
So it's a reflection x equals 1 and translated x comma y plus 3.
02:35
So that's for 19.
02:37
And i'm just going to erase these so i can do the rest of them.
02:42
I think what helps is that a coordinate plane sometimes helps so that you can visually see what you're doing...