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Basic Geometry : How to find the length of the side of a square

Study concepts, example questions & explanations for Basic Geometry

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Example Questions

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

Reducing the area of a square by 12% has the effect of reducing its sidelength by what percent (hearest whole percent)?

Possible Answers:

$3 \%$

$6 \%$

$12 \%$

$9 \%$

$15 \%$

Correct answer:

$6 \%$

Explanation:

The area of the square was originally

$A = s^{2}$ ,

being the sidelength.

Reducing the area by 12% means that the new area is 88% of the original area, or 0.88A ; the square root of this is the new sidelength, so

$0.88A = 0.88s^{2}$

$\sqrt{0.88A} = \sqrt{0.88s^{2}} = \sqrt{0.88} \cdot \sqrt{s^{2}} \approx 0.94 s$

Each side of the new square will measure 94% of the length of the old measure - a reduction by 6%.

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

The circle inscribed inside Square SQUA has circumference 16. To the nearest tenth, evaluate .

Possible Answers:

7.2

5.1

3.6

10.2

2.5

Correct answer:

5.1

Explanation:

The diameter of a circle that is inscribed inside a square is equal to its sidelength , so all we need to do is find the diameter of the circle - which is circumference 16 divided by $\pi$ :

$\frac{16}{\pi } \approx \frac{16}{3.1416 } \approx 5.1$ .

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

Thingy

Refer to the above figure, which shows equilateral triangle $\bigtriangleup CDE$ inside Square ABCD . Also, $\overline{EF} \perp \overline{AB}$ .

Quadrilateral BCEF has area 100. Which of these choices comes closest to ?

Possible Answers:

Correct answer:

Explanation:

Let s = CD , the sidelength shared by the square and the equilateral triangle.

The area of $\bigtriangleup CDE$ is

$\frac{s^{2}\sqrt{3}}{4} = \frac{\sqrt{3}}{4} \cdot s^{2} \approx \frac{1.7321}{4} \cdot s^{2} \approx 0.4330 s^{2}$

The area of Square ABCD is $s^{2}$ .

By symmetry, $\overline{EF}$ bisects the portion of the square not in the triangle, so the area of Quadrilateral BCEF is half the difference of those of the square and the triangle. Since the area of Quadrilateral BCEF is 100, we can set up an equation:

$\frac{1}{2}\left (s ^{2} - 0.4330 s ^{2} \right ) = 100$

$\frac{1}{2}\left ( 0.5670 s ^{2} \right ) = 100$

$0.2835 s ^{2} = 100$

$s ^{2} \approx 100 \div 0.2835$

$s ^{2} \approx 352.73$

$s \approx\sqrt{ 352.73} \approx 18.7$

Of the five choices, 20 comes closest.

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Example Question #11 : How To Find The Length Of The Side Of A Square

The perimeter of a square is 444 . What is the length of one side of the square?

Possible Answers:

116

111

101

112

Correct answer:

111

Explanation:

Recall how to find the perimeter of a square:

$\text{Perimeter}=4(\text{side length})$

By dividing both sides by , we can write the following:

$\text{Side length}=\frac{\text{Perimeter}}{4}$

For the square in question,

$\text{Side length}=\frac{444}{4}$

$\text{Side length}=111$

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Example Question #11 : How To Find The Length Of The Side Of A Square

The perimeter of a square is . What is the length of one side of the square?

Possible Answers:

Correct answer:

Explanation:

Recall how to find the perimeter of a square:

$\text{Perimeter}=4(\text{side length})$

By dividing both sides by , we can write the following:

$\text{Side length}=\frac{\text{Perimeter}}{4}$

For the square in question,

$\text{Side length}=\frac{96}{4}$

$\text{Side length}=24$

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Example Question #931 : Basic Geometry

The perimeter of a square is . What is the length of one side of the square?

Possible Answers:

2.5

3.5

Correct answer:

2.5

Explanation:

Recall how to find the perimeter of a square:

$\text{Perimeter}=4(\text{side length})$

By dividing both sides by , we can write the following:

$\text{Side length}=\frac{\text{Perimeter}}{4}$

For the square in question,

$\text{Side length}=\frac{10}{4}$

$\text{Side length}=2.5$

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Example Question #12 : How To Find The Length Of The Side Of A Square

The perimeter of a square is 0.8 . What is the length of one side of the square?

Possible Answers:

1.6

0.64

0.4

0.2

Correct answer:

0.2

Explanation:

Recall how to find the perimeter of a square:

$\text{Perimeter}=4(\text{side length})$

By dividing both sides by , we can write the following:

$\text{Side length}=\frac{\text{Perimeter}}{4}$

For the square in question,

$\text{Side length}=\frac{0.8}{4}$

$\text{Side length}=0.2$

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Example Question #941 : Plane Geometry

The perimeter of a square is 0.12 . What is the length of one side of the square?

Possible Answers:

0.06

0.03

0,14

0.04

Correct answer:

0.03

Explanation:

Recall how to find the perimeter of a square:

$\text{Perimeter}=4(\text{side length})$

By dividing both sides by , we can write the following:

$\text{Side length}=\frac{\text{Perimeter}}{4}$

For the square in question,

$\text{Side length}=\frac{0.12}{4}$

$\text{Side length}=0.03$

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Example Question #282 : Squares

The perimeter of a square is 0.4 . What is the length of one side of the square?

Possible Answers:

0.16

0.8

0.1

0.2

Correct answer:

0.1

Explanation:

Recall how to find the perimeter of a square:

$\text{Perimeter}=4(\text{side length})$

By dividing both sides by , we can write the following:

$\text{Side length}=\frac{\text{Perimeter}}{4}$

For the square in question,

$\text{Side length}=\frac{0.4}{4}$

$\text{Side length}=0.1$

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Example Question #283 : Squares

The perimeter of a square is 0.16 . What is the length of one side of the square?

Possible Answers:

0.32

0.08

0.04

0.02

Correct answer:

0.04

Explanation:

Recall how to find the perimeter of a square:

$\text{Perimeter}=4(\text{side length})$

By dividing both sides by , we can write the following:

$\text{Side length}=\frac{\text{Perimeter}}{4}$

For the square in question,

$\text{Side length}=\frac{0.16}{4}$

$\text{Side length}=0.04$

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Basic Geometry : How to find the length of the side of a square

Study concepts, example questions & explanations for Basic Geometry

All Basic Geometry Resources

Example Questions

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

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

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

Example Question #11 : How To Find The Length Of The Side Of A Square

Example Question #11 : How To Find The Length Of The Side Of A Square

Example Question #931 : Basic Geometry

Example Question #12 : How To Find The Length Of The Side Of A Square

Example Question #941 : Plane Geometry

Example Question #282 : Squares

Example Question #283 : Squares

All Basic Geometry Resources

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