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SAT Math 9.5 Geometry and Measurement 199 Views


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SAT Math 9.5 Geometry and Measurement

Language:
English Language

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?

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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