SAT Math : Cylinders

Study concepts, example questions & explanations for SAT Math

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Example Questions

Example Question #151 : Solid Geometry

ABC Pipeworks manufactures a 12 foot copper alloy pipe that has an internal diameter of 0.76 inches and an external diameter of 0.88 inches. If two grams of copper are in every 3 cubic inches of pipe material. How many grams of copper are in this pipe?

Possible Answers:

Correct answer:

Explanation:

First convert all units to inches. 

internal diameter: 0.76 inches

external diameter: 0.88 inches

length: 144 inches

You are going to need to subtract the interior volume of the empty space inside the pipe from the external volume of the of the pipe.


Copper pipe

 

Now, we need to determine how many grams of copper are in the pipe. 

Example Question #851 : Sat Mathematics

Find the volume of the figure.

7

Possible Answers:

Correct answer:

Explanation:

13

In order to find the volume of the figure, we will first need to find the volume of both cylinders.

Recall how to find the volume of the cylinder:

Now, use the given radius and height to find the volume of the larger cylinder.

Next, use the given radius and height to find the volume of the smaller cylinder.

Subtract the volume of the smaller cylinder from the volume of the larger one to find the volume of the figure.

Make sure to round to  places after the decimal.

Example Question #113 : Solid Geometry

Find the volume of the figure.

8

Possible Answers:

Correct answer:

Explanation:

13

In order to find the volume of the figure, we will first need to find the volume of both cylinders.

Recall how to find the volume of the cylinder:

Now, use the given radius and height to find the volume of the larger cylinder.

Next, use the given radius and height to find the volume of the smaller cylinder.

Subtract the volume of the smaller cylinder from the volume of the larger one to find the volume of the figure.

Make sure to round to  places after the decimal.

Example Question #29 : How To Find The Volume Of A Cylinder

Find the volume of the figure.

9

Possible Answers:

Correct answer:

Explanation:

13

In order to find the volume of the figure, we will first need to find the volume of both cylinders.

Recall how to find the volume of the cylinder:

Now, use the given radius and height to find the volume of the larger cylinder.

Next, use the given radius and height to find the volume of the smaller cylinder.

Subtract the volume of the smaller cylinder from the volume of the larger one to find the volume of the figure.

Make sure to round to  places after the decimal.

Example Question #42 : Cylinders

Find the volume of the figure.

10

Possible Answers:

Correct answer:

Explanation:

13

In order to find the volume of the figure, we will first need to find the volume of both cylinders.

Recall how to find the volume of the cylinder:

Now, use the given radius and height to find the volume of the larger cylinder.

Next, use the given radius and height to find the volume of the smaller cylinder.

Subtract the volume of the smaller cylinder from the volume of the larger one to find the volume of the figure.

Make sure to round to  places after the decimal.

Example Question #11 : Cylinders

Jessica wishes to fill up a cylinder with water at a rate of  gallons per minute. The volume of the cylinder is  gallons. The hole at the bottom of the cylinder leaks out  gallons per minute. If there are  gallons in the cylinder when Jessica starts filling it, how long does it take to fill?

Possible Answers:

Correct answer:

Explanation:

Jessica needs to fill up  gallons at the effective rate of .  divided by  is equal to . Notice how the units work out.

Example Question #31 : How To Find The Volume Of A Cylinder

The figure below represents a cylinder with a smaller cylinder removed from its middle.

 

Find the volume of the figure.

6

Possible Answers:

Correct answer:

Explanation:

13

In order to find the volume of the figure, we will first need to find the volume of both cylinders.

Recall how to find the volume of the cylinder:

Now, use the given radius and height to find the volume of the larger cylinder.

Next, use the given radius and height to find the volume of the smaller cylinder.

Subtract the volume of the smaller cylinder from the volume of the larger one to find the volume of the figure.

Make sure to round to  places after the decimal.

Example Question #1 : Cylinders

An upright cylinder with a height of 30 and a radius of 5 is in a big tub being filled with oil. If only the top 10% of the cylinder is visible, what is the surface area of the submerged cylinder?

Possible Answers:

345π

295π

270π

300π

325π

Correct answer:

295π

Explanation:

The height of the submerged part of the cylinder is 27cm. 2πrh + πr2 is equal to 270π + 25π = 295π

Example Question #1 : Cylinders

A right circular cylinder has a height of 41 in. and a lateral area (excluding top and bottom) 512.5π in2. What is the area of its bases?

Possible Answers:

None of the other answers

312.5 in2

78.125π in2

156.25 in2

39.0625π in2

Correct answer:

78.125π in2

Explanation:

The lateral area (not including its bases) is equal to the circumference of the base times the height of the cylinder. Think of it like a label that is wrapped around a soup can. Therefore, we can write this area as:

A = h * π * d or A = h * π * 2r = 2πrh

Now, substituting in our values, we get:

512.5π = 2 * 41*rπ; 512.5π = 82rπ

Solve for r by dividing both sides by 82π:

6.25 = r

From here, we can calculate the area of a base:

A = 6.252π = 39.0625π

NOTE: The question asks for the area of the bases. Therefore, the answer is 2 * 39.0625π or 78.125π in2.

Example Question #1 : How To Find The Surface Area Of A Cylinder

The diameter of the lid of a right cylindrical soup can is 5 in. If the can is 12 inches tall and the label costs $0.00125 per square inch to print, what is the cost to produce a label for a can? (Round to the nearest cent.)

Possible Answers:

$0.16

$0.24

$1.18

$0.08

$0.29

Correct answer:

$0.24

Explanation:

The general mechanics of this problem are simple. The lateral area of a right cylinder (excluding its top and bottom) is equal to the circumference of the top times the height of the cylinder. Therefore, the area of this can's surface is: 5π * 12 or 60π. If the cost per square inch is $0.00125, a single label will cost 0.00125 * 60π or $0.075π or approximately $0.24.

 

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