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Playlist Circles 22 videos

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Attributes of Circles
6372 Views

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
10659 Views

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
2667 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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