ISEE Lower Level Math : How to find the area of a square

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

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Example Questions

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

If the perimeter of a square is 18 cm, what must the area of this square be?

Possible Answers:

18cm2

81cm2

16cm2

25cm2

20.25cm2

Correct answer:

20.25cm2

Explanation:

Remember that a square has four sides, each side with equal lengths. If a square has a perimeter of 18 cm, that means that each side has a length of

18 ÷ 4 =

4.5 cm.

The formula for the area of a square is length x width or length squared (length x length), since each side of a square has the same length.

So,

4.5 x 4.5 =

20.25cm2

 

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

What is the area of a square that has a side with a length of 9 cm?

Possible Answers:

18

36

63

81

Correct answer:

81

Explanation:

The area of a square can be found using the same equation as the area of a rectangle - length times width.

However, in the case of a square, all of the sides are of equal length. Therefore, the area of a square can be found using the equation:

or

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

What is the area of a square that has a side with a length of 10 in.?

Possible Answers:

Correct answer:

Explanation:

To calculate the area of a square, you need to multiply the length by the width. By definition, a square has 4 equal sides. So, by knowing the length of one side of the square, you know the length measurement and the width measurement.

Since the length of one side of this square is 10 in., you would multiply to get the answer.

Because area is the number of squares that would be used to cover the inside the shape, it is given in units2. As a result, the answer is 100 in.2.

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

The perimeter of a square is .  What is the area?

Possible Answers:

Correct answer:

Explanation:

The perimeter of a square is given by .  Here , so divide by four to get .

The area of a square is given by . Substitute the side length obtained from the perimeter equation to get .

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

The perimeter of a square is .  What is the area?

Possible Answers:

Correct answer:

Explanation:

The perimeter of a square is given by ,  or . Divide by four to get .

The area of a square is given by . Substitute the side length obtained from the perimeter equation to get .

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

The perimeter of a square is .  What is the area?

Possible Answers:

Correct answer:

Explanation:

The perimeter of a square is given by ,  or . Divide by four to get .

The area of a square is given by . Substitute the value obtained from the perimeter equation to get .

 

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

The perimeter of a square is .  What is the area?

Possible Answers:

Correct answer:

Explanation:

The perimeter of a square is given by ,  or . Divide by four to get .

The area of a square is given by . Substitute the side length obtained from the perimeter equation to get .

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

What is the area of a square with a side that measures  feet?

Possible Answers:

 square feet

 square feet

 square feet

 square feet

Correct answer:

 square feet

Explanation:

The area of a square can be found using the following formula:

The side measures  feet. 

Therefore, the area of the square is  square feet.

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

Becca takes a square napkin and folds it in half once. She then folds it in half again. When she unfolds it, the creases create lines. What best describes the pattern created by the creases?

Possible Answers:

2 rectangles

4 rectangles

2 squares

4 squares

Correct answer:

4 squares

Explanation:

When a napkin is folded in half once, a crease is created vertically down the middle of the napkin. When folded in half once again, another crease is created horizontally across the middle. This creates four squares. Therefore, the best answer is "4 squares."

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

A square has a perimeter of 24 inches. What is the area of the square?

Possible Answers:

Correct answer:

Explanation:

Given that all four sides of a square are equal, if the perimeter is 24 inches, then you need to divide by 4 to find the length of each side.

The area is found by multiplying two sides together.

Plug in the value of to solve.

Therefore,  is the correct answer. 

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