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This video can run circles around other videos about circles. Sir Cumference, of Round Table fame, explains all the properties of… well, circles....
Time to learn about the area of a sector. And no, that's not the sector's bedroom with a bumper sticker on the door that reads, "GO AWAY."
It's super useful to be able to find the distance around stuff. Like when you’re being pursued by authorities while running around the base of an...
CAHSEE Math 6.3 Measurement and Geometry 211 Views
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Description:
Measurement and Geometry Drill 6 Problem 3. If triangle ABC is congruent to triangle XYZ, then XYZ must be which of the following?
Transcript
- 00:03
Here’s an unshmoopy question you’ll find on an exam somewhere in life.
- 00:07
If triangle ABC shown below is congruent to triangle XYZ, then ΔXYZ must be which of the following?
- 00:14
And here are the potential answers...
- 00:19
Ok, what is this question asking?
- 00:22
Really… just that we know what “congruent” means.
Full Transcript
- 00:30
Good thing we stayed awake in class the day they went over all the vocab.
- 00:34
For two triangles to be congruent, all corresponding sides and angles must be the same.
- 00:41
A is ruled out because… no offense, but it’s a big fat fatty.
- 00:46
The angle at the top is bigger, and the angles at the bottom are smaller.
- 00:51
The triangle in B is oriented differently… but check it out.
- 00:54
All angles and side lengths appear to be equal, even if some sneaky person DID rotate the thing.
- 01:01
What about C?
- 01:02
Looks like we’ve got a right angle here…
- 01:04
…while ABC is more… equilateral. So let’s cross that one off, too.
- 01:09
Finally, D… not even close. Here we have an angle even greater than 90 degrees.
- 01:14
Must be from Florida.
- 01:17
Choice B. That's it. Choice B is the one... “Best answer.”
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