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SAT Math Videos 171 videos
SAT Math 1.1 Algebra and Functions. Find an algebraic equation to correspond with the data.
SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?
SAT Math 1.1 Numbers and Operations. How many combinations of beverage and cereal can be made?
SAT Math 10.2 Geometry and Measurement 198 Views
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Description:
SAT Math 10.2 Geometry and Measurement. How far does a point on the outside of the circle travel?
Transcript
- 00:02
Here’s your shmoop du jour, brought to you by the wheel.
- 00:06
The second best invention of all time, after that “upright sleeper” we bought from SkyMall.
- 00:11
A wheel with a diameter of 12 inches makes four rotations.
- 00:15
How far does a point on the outside of the circle travel?
- 00:19
Use 3.14 for pi and round to the nearest whole number, measured in inches.
Full Transcript
- 00:28
Hopefully our destination isn’t too remote, because with our wheel only making
- 00:31
4 rotations, it doesn’t appear we’re going very far.
- 00:34
So… our wheel…we’ll call it a circle for practical purposes…
- 00:36
…has a diameter of 12 inches.
- 00:39
We know the circumference of a circle is diameter times pi, and we’re told to just round pi
- 00:46
down to two decimal places…
- 00:48
…so…we get 12 times 3.14 comes out to 37.68 inches.
- 00:54
But that’s just the distance around the edge of the wheel for ONE rotation.
- 00:58
We’re spinnin’ this bad boy around FOUR times…
- 01:01
...so 37.68 times 4 is 150.72 inches…
- 01:07
…now we round to the nearest whole number, and we come out with 151 inches
- 01:12
Sheesh, that was a lot of effort just to move forward a few yards.
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