Common Core: 7th Grade Math : Solve for surface area

Study concepts, example questions & explanations for Common Core: 7th Grade Math

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Example Questions

Example Question #1 : Solve For Surface Area

The length of the side of a cube is . Give its surface area in terms of .

Possible Answers:

Correct answer:

Explanation:

Substitute  in the formula for the surface area of a cube:

Example Question #1 : Solve Problems Involving Area, Volume And Surface Area Of Two And Three Dimensional Objects: Ccss.Math.Content.7.G.B.6

If a cube has one side measuring cm, what is the surface area of the cube? 

Possible Answers:

Correct answer:

Explanation:

To find the surface area of a cube, use the formula , where represents the length of the side.  Since the side of the cube measures , we can substitute in for .

Example Question #1 : Solve For Surface Area

Find the surface area of a non-cubic prism with the following measurements:

Possible Answers:

Correct answer:

Explanation:

The surface area of a non-cubic prism can be determined using the equation:

Example Question #71 : Geometry

A small rectangular jewelry box has two square ends with areas of 36 square centimeters, and a width of 10 centimeters.  What is the surface area of the outside of the jewelry box.

 

Possible Answers:

Correct answer:

Explanation:

To find the surface area of the rectangular box we just need to add up the areas of all six sides. We know that two of the sides are 36 square centimeters, that means we need to find the areas of the four mising sides. To find the area of the missing sides we can just multiply the side of one of the squares (6 cm) by the width of the box:

But remember we have four of these rectangular sides:

Now we just add the two square sides and four rectangular sides to find the total surface area of the jewelry box:

That is the total surface area!

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

Alice is wrapping a rectangular box that measures .  How many square feet of wrapping paper does she need?

Possible Answers:

Correct answer:

Explanation:

The surface area of a rectangular prism is given by

 where is the length, is the width, and is the height.

Let , , and 

So the equation to solve becomes  or 

However the question asks for an answer in square feet.  Knowing that  we can convert square inches to square feet.  It will take  of paper to wrap the present.

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