ISEE Lower Level Quantitative : Rectangles

Study concepts, example questions & explanations for ISEE Lower Level Quantitative

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Example Questions

Example Question #231 : Quadrilaterals

What could be the dimensions of a rectangle with an area of \(\displaystyle 36\ cm^{2}\)?

Possible Answers:

\(\displaystyle 3\ cm\times 2\ cm\)

\(\displaystyle 10\ cm\times 16\ cm\)

\(\displaystyle 8\ cm\times 3\ cm\)

\(\displaystyle 9\ cm\times 4\ cm\)

Correct answer:

\(\displaystyle 9\ cm\times 4\ cm\)

Explanation:

Since area is length times width, the answer must equal 36 when multiplied. The only combination is 9cm by 4cm.

Example Question #2 : How To Find The Area Of A Rectangle

Yard

The above diagram shows a rectangular home within a rectangular yard. What is the area of the yard?

Possible Answers:

\(\displaystyle 3,200 \textrm{ ft}^{2}\)

\(\displaystyle 32,000 \textrm{ ft}^{2}\)

\(\displaystyle 48,200 \textrm{ ft}^{2}\)

\(\displaystyle 50,000 \textrm{ ft}^{2}\)

\(\displaystyle 42,000 \textrm{ ft}^{2}\)

Correct answer:

\(\displaystyle 48,200 \textrm{ ft}^{2}\)

Explanation:

The area of the yard is the area of the smaller rectangle subtracted from that of the larger rectangle. The area of a rectangle is the product of its length and its height, so the larger rectangle has area

\(\displaystyle 250 \times 200 = 50,000\) square feet,

and the smaller rectangle has area 

\(\displaystyle 60 \times 30 = 1,800\) square feet.

Subtract to get the area of the yard:

\(\displaystyle 50,000 - 1,800 = 48,200\) square feet.

Example Question #232 : Quadrilaterals

Swimming_pool

Give the area of the rectangular swimming pool shown above.

Possible Answers:

\(\displaystyle 3,400 \textrm{ ft}^{2}\)

\(\displaystyle 1,750 \textrm{ ft}^{2}\)

\(\displaystyle 3,500 \textrm{ ft}^{2}\)

\(\displaystyle 1,850 \textrm{ ft}^{2}\)

Correct answer:

\(\displaystyle 1,750 \textrm{ ft}^{2}\)

Explanation:

The length and the width of the pool are 50 feet and 35 feet; the area of this rectangle is their product, or

\(\displaystyle A = 50 \times 35 = 1,750\) square feet.

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

Find the area of the following rectangle. 

5

Possible Answers:

\(\displaystyle 18\)

\(\displaystyle 36\)

\(\displaystyle 9\)

\(\displaystyle 80\)

Correct answer:

\(\displaystyle 80\)

Explanation:

The equation for the area of a rectangle is \(\displaystyle A=l\times w\)

In this case, we have:

\(\displaystyle A=10\times 8=80\)

Example Question #2 : How To Find The Area Of A Rectangle

Find the area of the following rectangle.

6

Possible Answers:

\(\displaystyle 18\)

\(\displaystyle 36\)

\(\displaystyle 77\)

\(\displaystyle 9\)

Correct answer:

\(\displaystyle 77\)

Explanation:

To find the area of the rectangle we use the equation \(\displaystyle A=l \times w\)

In this case, we have: 

\(\displaystyle A= 11\times 7 =77\)

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

Find the area of the following rectangle.

7

Possible Answers:

\(\displaystyle 42\)

\(\displaystyle 30\)

\(\displaystyle 21\)

\(\displaystyle 108\)

Correct answer:

\(\displaystyle 108\)

Explanation:

In order to find the area of the rectangle we use the equation \(\displaystyle A=l \times w\)

In this case, we have:

\(\displaystyle A=12\times 9=108\)

Example Question #7 : How To Find The Area Of A Rectangle

A rectangle with its length and its width is shown below. 

1

If the area of a rectangle is \(\displaystyle \text{length}\times\text{width}\), what is the area of the rectangle above?

Possible Answers:

\(\displaystyle 3a+6\)

\(\displaystyle 6\times3\)

\(\displaystyle 3a\times6\)

\(\displaystyle 6a\times3a\)

Correct answer:

\(\displaystyle 3a\times6\)

Explanation:

13

Since the question tells you the formula to find the area of a rectangle, plug in the given values found in the figure to get the correct answer.

For the figure given, \(\displaystyle \text{width}=6\) and \(\displaystyle \text{length}=3a\).

\(\displaystyle \text{Area of Rectangle}=\text{length}\times\text{width}\)

\(\displaystyle \text{Area of Rectangle}=3a\times6\)

Example Question #8 : How To Find The Area Of A Rectangle

A rectangle with its length and its width is shown below.

2

If the area of a rectangle is \(\displaystyle \text{length}\times\text{width}\), what is the area of the rectangle above?

Possible Answers:

\(\displaystyle 5b\times b\)

\(\displaystyle b\times5\)

\(\displaystyle b+5\)

\(\displaystyle 5+1\)

Correct answer:

\(\displaystyle b\times5\)

Explanation:

13

Since the question tells you the formula to find the area of a rectangle, plug in the given values found in the figure to get the correct answer.

For the figure given, \(\displaystyle \text{width}=5\) and \(\displaystyle \text{length}=b\).

\(\displaystyle \text{Area of Rectangle}=\text{length}\times\text{width}\)

\(\displaystyle \text{Area of Rectangle}=b\times 5\)

Example Question #9 : How To Find The Area Of A Rectangle

A rectangle with its length and width is shown below.

3

If the area of a rectangle is \(\displaystyle \text{length}\times\text{width}\), what is the area of the rectangle above?

Possible Answers:

\(\displaystyle 6c + 15\)

\(\displaystyle 6c\times15c\)

\(\displaystyle 6c\times 15\)

\(\displaystyle 6\times15\)

Correct answer:

\(\displaystyle 6c\times 15\)

Explanation:

13

Since the question tells you the formula to find the area of a rectangle, plug in the given values found in the figure to get the correct answer.

For the figure given, \(\displaystyle \text{width}=15\) and \(\displaystyle \text{length}=6c\).

\(\displaystyle \text{Area of Rectangle}=\text{length}\times\text{width}\)

\(\displaystyle \text{Area of Rectangle}=6c\times15\)

Example Question #10 : How To Find The Area Of A Rectangle

A rectangle with its length and its width is shown below.

 

4

If the area of a rectangle is \(\displaystyle \text{length}\times\text{width}\), what is the area of the rectangle above?

Possible Answers:

\(\displaystyle 3d\times20d\)

\(\displaystyle 3d-20\)

\(\displaystyle 3d\times20\)

\(\displaystyle 3d+20d\)

Correct answer:

\(\displaystyle 3d\times20\)

Explanation:

13

Since the question tells you the formula to find the area of a rectangle, plug in the given values found in the figure to get the correct answer.

For the figure given, \(\displaystyle \text{width}=20\) and \(\displaystyle \text{length}=3d\).

\(\displaystyle \text{Area of Rectangle}=\text{length}\times\text{width}\)

\(\displaystyle \text{Area of Rectangle}=3d\times20\)

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