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Coordinates and Graphs Videos 64 videos
The video will show you how to plot points in 3D using the axes of the 3D coordinate system. Make sure you're wearing your special glasses for this...
When graphing inequalities, you graph the line, shade the corresponding side, and plug in the point. The end!
One formula to rule them all, one formula to find them. One formula to bring them all, and in the darkness bind them. Or something like that. I...
SAT Math 1.2 Geometry and Measurement 246 Views
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Description:
SAT Math: Geometry and Measurement Drill 1, Problem 2. If A = (0, 4), B = (-3, 2), and C = (1, 0), which point is in the interior of angle ABC?
Transcript
- 00:02
Here’s your shmoop du jour, brought to you by coordinates.
- 00:06
Without them we'd never be able to remember where we buried those barrels full of cash.
- 00:11
If A = (0, 4), B = (-3, 2), and C = (1, 0), which point is in the interior of angle ABC?
- 00:22
Here are your choices...
- 00:27
Well it’s no good trying to imagine this stuff in our mind’s eye,
Full Transcript
- 00:30
when we have access to the magic of pencils…
- 00:32
…so you always draw a picture...
- 00:35
…okay, more points and angles, fewer unicorns. There we go. Here are our three points…
- 00:41
…so if we set this up on a standard grid and connect the dots, we see our triangle taking shape.
- 00:47
Now, what is this question asking us?
- 00:49
Which of these five points is in the interior of the angle…
- 00:55
…in other words, which one will be all snug and warm inside the triangle while the other
- 00:58
four are outside shivering and catching their death of cold?
- 01:02
No shortcuts here – we just need to plot each point and see where it lands…
- 01:05
And boom, we’re done. We can see quite plainly that point (0, 2) is the only one that doesn’t
- 01:12
need to invest in a winter jacket. Answer: B.
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