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SAT Math 9.5 Geometry and Measurement 199 Views
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Description:
SAT Math 9.5 Geometry and Measurement
Transcript
- 00:02
Here’s your shmoop du jour, brought to you by formulas.
- 00:06
The number one choice of race car drivers and babies.
- 00:10
A cylinder 10 feet long and with a radius of 4.5 feet needs to be painted on all surfaces.
- 00:18
One can of paint will cover 20 square feet.
- 00:20
How many cans are needed?
Full Transcript
- 00:22
Here are the potential answers...
- 00:27
We’re not sure what we did to deserve this cruel and unusual punishment…
- 00:30
…but we must have done SOMETHING to be charged with this community service project.
- 00:34
This one’s pretty simple…all we need is to know the formula for the surface area of a cylinder.
- 00:39
The formula in question is 2 pi r squared plus length times pi 2r…
- 00:45
…then we can just plug in our radius of 4.5 and our length of 10.
- 00:49
We need to now see what our calculator has to say about it.
- 00:52
It comes out to 409.77.
- 00:55
We know that one can of paint will cover 20 square feet…
- 00:58
…so we take 409.77 and divide it by 20 to get 20 point…something.
- 01:04
Doesn’t really matter what comes after the decimal point, because we’re going to have to round up…
- 01:08
...we need a whole other can of paint. Right?
- 01:10
The answer is 21 cans and that's choice B…and we’re done.
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