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Playlist Circles 22 videos

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Attributes of Circles
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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....

1
Perimeter and Circumference
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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...

2
Area of a Sector
2665 Views

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."

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SAT Math 5.1 Geometry and Measurement 219 Views


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Description:

SAT Math 5.1 Geometry and Measurement

Language:
English Language

Transcript

00:02

Here’s your shmoop du jour, brought to you by 45 degrees.

00:06

If a right angle is 90 degrees, we guess this angle is only half right.

00:12

What angle is made when the hands of a clock are at 2:30?

00:15

Here are the potential answers...

00:18

Alright, where to begin….

00:20

so… a “clock” is this type of antiquated time-telling device used in the era before cell phones…

00:27

All right, so we’ve got our minute hand, which is obviously pointing to the…minute.

00:31

The hour hand, however, is a bit trickier.

00:34

Rather than making a big jump suddenly from the 2 to the 3 at some point,

00:38

it meanders slowly during the hour...

00:40

But we’re dealing with 2:30, which should be easy –

00:43

we’re exactly halfway between 2 and 3 o’clock, right here.

00:48

We know that a circle has 360 total degrees…

00:51

…so the angle between any two numbers on a clock face must be one-twelfth of that…or 30 degrees.

00:58

Looking at our hands…not those, focus on the problem, please…

01:02

…we can see that we are looking for an angle equivalent to 3 and a half hours.

01:07

At 3.5 times 30 or 105… so our solution is choice B.

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