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Geometry and Measurement Videos 48 videos

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SAT Math 7.2 Geometry and Measurement 235 Views


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Description:

SAT Math 7.2 Geometry and Measurement

Language:
English Language

Transcript

00:02

Here’s your shmoop du jour, brought to you by deadly spiders. Hope you don’t have algebraphobia.

00:11

Which of the following could NOT be the value of x?

00:14

Note that the figure is not drawn to scale.

00:16

Here are the potential answers...

00:22

Thank goodness this figure is not drawn to scale.

00:25

For a second there, we were worried we were about to be attacked by this Daddy-long-legs from Hell…

00:29

All right, so this question wants to know what x is definitely not.

00:33

We’re not given any precise values… just a bunch of x’s and y’s…

00:36

so we have to think about what else we know…

00:39

Well… we know that if we add up all these angles, they have to come out to 360.

00:44

Our figure isn’t a circle, exactly, but the angles go all the way around in a circle,

00:49

so it’s basically the same deal.

00:50

Now… what do we have?

00:52

They give us 2x + x + x + y + 2x + x + x + y.

00:59

Once we combine like terms, that gets us to 8x plus 2y.

01:04

We have no idea what y is… all we know is that 8x can’t be more than 360 degrees total.

01:11

So…our first instinct should be to check out E, 50, which is the biggest number of the bunch.

01:17

8 times 50 is 400… which is indeed more than 360.

01:22

If we wanted we could check the others… but even choice D, 40, would be fine.

01:26

8 times 40 is 320, which is under that 360 degree mark.

01:30

So our answer is clearly choice E.

01:32

As in, “Exterminator.”

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