ISEE Upper Level Quantitative : How to find the area of a rectangle

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

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Example Questions

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

Which is the greater quantity?

(a) The area of the rectangle on the coordinate plane with vertices 

(b) The area of the rectangle on the coordinate plane with vertices 

Possible Answers:

(a) is greater.

It is impossible to tell from the information given.

(a) and (b) are equal.

(b) is greater.

Correct answer:

(a) and (b) are equal.

Explanation:

(a) The first rectangle has width  and height ; its area is .

(b) The second rectangle has width  and height ; its area is .

The areas of the rectangle are the same.

Example Question #2 : Rectangles

A rectangle on the coordinate plane has its vertices at the points .

Which is the greater quantity?

(a) The area of the portion of the rectangle in Quadrant I

(b) The area of the portion of the rectangle in Quadrant III

Possible Answers:

(b) is greater.

(a) and (b) are equal.

It is impossible to tell from the information given.

(a) is greater.

Correct answer:

(a) and (b) are equal.

Explanation:

(a) The portion of the rectangle in Quadrant I is a rectangle with vertices , so its area is .

(a) The portion of the rectangle in Quadrant III is a rectangle with vertices , so its area is .

 

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

. Which is the greater quantity?

(a) The area of the square on the coordinate plane with vertices 

(b) The area of the rectangle on the coordinate plane with vertices 

Possible Answers:

(a) is greater.

It is impossible to tell from the information given.

(a) and (b) are equal.

(b) is greater.

Correct answer:

(a) is greater.

Explanation:

(a) The square has sidelength , and therefore has area .

(b) The rectangle has width  and height , and therefore has area .

Since , the square in (a) has the greater area.

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

The perimeter of a rectangle is one yard. The rectangle is three times as long as it is wide. Which is the greater quantity?

(a) The area of the rectangle

(b) 60 square inches

Possible Answers:

(a) and (b) are equal

(a) is greater

It is impossible to tell form the information given

(b) is greater

Correct answer:

(a) is greater

Explanation:

Let  be the width of the rectangle. Then its length is , and its perimeter is 

Since the perimeter is one yard, or 36 inches, 

 inches is the wiidth, and  inches is the length, so the area is 

 square inches. (a) is the greater quantity.

 

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

If one rectangular park measures  and another rectangular park measures , how many times greater is the area of the second park than the area of the first park?

Possible Answers:

Correct answer:

Explanation:

First, you must compute the area of both parks. The area of a rectangle is length times width. Therefore, the area of park one is , which is . The area of park two is , which is Then, divide the area of the second park by the area of the first park (). This yields 3 as the answer.

Example Question #5 : How To Find The Area Of A Rectangle

The sum of the lengths of three sides of a rectangle is 572 inches; the width of the rectangle is 60% of its length. Give its area in square inches.

Possible Answers:

It is impossible to determine the area from the given information.

Correct answer:

It is impossible to determine the area from the given information.

Explanation:

Since the width of the rectangle is 60% of its length, we can write .

However, it is not clear from the problem which three sides - two lengths and a width or two widths and a length - we are choosing to have sum 572 inches. Depending on the three sides chosen, we can either set up 

or

 

Since the length cannot be determined with certainty, neither can the width, and, subsequently, neither can the area.

Example Question #6 : How To Find The Area Of A Rectangle

Five rectangles each have the same length, which we will call . The widths of the five rectangles are 7, 5, 8, 10, and 12. Which of the following expressions is equal to the mean of their areas?

Possible Answers:

Correct answer:

Explanation:

The area of a rectangle is the product of its width and its length. The areas of the five rectangles, therefore, are . The mean of these five areas is their sum divided by 5, or

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

Two rectangles, A and B, each have perimeter 32 feet. Rectangle A has length 12 feet; Rectangle B has length 10 feet. The area of Rectangle A is what percent of the area of Rectangle B? 

Possible Answers:

Correct answer:

Explanation:

The perimeter of a rectangle can be given by the formula

Since for both rectangles, 30 is the perimeter, this becomes 

, and subsequently

.

Rectangle A has length 12 feet and, subsequently. width 4 feet, making its area

 square feet

Rectangle B has length 10 feet and, subsequently. width 6 feet, making its area

 square feet

The area of Rectangle A is

of the area of Rectangle B.

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

Rectangle

Give the area of the above rectangle in terms of 

Possible Answers:

Correct answer:

Explanation:

The area of a rectangle is equal to the product of its length and height, which here are 5 and . This product is .

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

A rectangle is two feet shorter than twice its width; its perimeter is six yards. Give its area in square inches.

Possible Answers:

Correct answer:

Explanation:

The length of the rectangle is two feet, or 24 inches, shorter than twice the width, so, if  is the width in inches,  the length in inches is 

Six yards, the perimeter of the rectangle, is equal to  inches. The perimeter, in terms of length and width, is , so we can set up the equation:

The length and width are 64 inches and 44 inches; the area is their product, which is 

 square inches

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