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Geometry and Measurement Videos 87 videos

SAT Math 1.1 Geometry and Measurement
719 Views

SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?

SAT Math 1.2 Geometry and Measurement
246 Views

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 1.3 Geometry and Measurement
231 Views

SAT Math 1.3 Geometry and Measurement. Find the length of CE.

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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

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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