ACT Math : ACT Math

Study concepts, example questions & explanations for ACT Math

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Example Questions

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

What is the surface area, in square inches, of a four-inch cube?

Possible Answers:

Correct answer:

Explanation:

To answer this question, we need to find the surface area of a cube.

To do this, we must find the area of one face and multiply it by , because a cube has  faces that are square in shape and equal in size. 

To find the area of a square, you multiply its length by its width. (Note that the length and width of a square are the same.) Therefore, for this data:

We now must multiply the area of one face by 6 to get the total surface are of the cube.

Therefore, the surface are of a four-inch cube is .

Example Question #4 : How To Find The Surface Area Of A Cube

What is the surface area of a cube with a volume of ? Round your answer to the nearest hundreth if necessary

Possible Answers:

Correct answer:

Explanation:

First we need to find the side length of the cube. Do that by taking the cube root of the volume.

 = 
Next plug the side length into the formula for the surface area of a cube:



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

What is the surface area, in square inches, of a cube with sides measuring  ?

Possible Answers:

Correct answer:

Explanation:

The surface area of a cube is a measure of the total area of the surface of all of the sides of that cube.

 

Since a cube contains  square sides, the surface area is  times the area of a square side.

 

The area of one square side is sidelength  sidelength, or  in this case. Therefore, the surface area of this cube is  square inches.

Example Question #3 : How To Find The Surface Area Of A Cube

What is the length of the side of a cube whose surface area is equal to its volume?

Possible Answers:

There is not enough information to determine the answer.

Correct answer:

Explanation:

To find the side length of a cube whose surface area is the same as its volume, set the surface area and volume equations of a cube equal to each other, the solve for the side length:

Set these two formulas equal to eachother and solve for s.

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

What is the surface area of a cube with a side of length ?

Possible Answers:

Correct answer:

Explanation:

To find the surface area of a cube with a given side length,  use the formula:

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

Find the surface area of a cube whose side length is .

Possible Answers:

Correct answer:

Explanation:

To find surface area of a cube, simply calculate the area of one side and multiply it by . Thus,

 

Example Question #21 : Cubes

Find the surface area of a cube whose side length is .

Possible Answers:

Correct answer:

Explanation:

To find surface aarea, simply multiply the area of a face by 6 since there are 6 faces. Thus,

Example Question #22 : Cubes

Find the surface area of a cube with side length .

Possible Answers:

Correct answer:

Explanation:

To solve, simply multiply the face area by . Thus,

Example Question #22 : Cubes

What is the sum of the number of vertices, edges, and faces of a cube?

Possible Answers:

20

26

None of the answers are correct

24

18

Correct answer:

26

Explanation:

Vertices = three planes coming together at a point = 8

Edges = two planes coming together to form a line = 12

Faces = one plane as the surface of the solid = 6

Vertices + Edges + Faces = 8 + 12 + 6 = 26

Example Question #671 : Geometry

What is the difference in volume between a sphere with radius x and a cube with a side of 2x? Let π = 3.14

Possible Answers:

4.18x3

6.73x3

5.28x3

8.00x3

3.82x3

Correct answer:

3.82x3

Explanation:

Vcube = s3 = (2x)3 = 8x3

Vsphere = 4/3 πr3 = 4/3•3.14•x3 = 4.18x

 

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