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SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?
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?
SAT Math 2.3 Geometry and Measurement. Find the length of AB.
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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