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High School Math : How to find the length of the diagonal of a square

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

What is the length of a diagonal of a square with a side length ? Round to the nearest tenth.

Possible Answers:

9.0

10.4

6.7

8.5

Correct answer:

8.5

Explanation:

A square is comprised of two 45-45-90 right triangles. The hypotenuse of a 45-45-90 right triangle follows the rule below, where is the length of the sides.

$hypotenuse=x\sqrt2$

In this instance, is equal to 6.

$hypotenuse=6\sqrt2=8.5$

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

A square has sides of . What is the length of the diagonal of this square?

Possible Answers:

$10\sqrt{2}$

$5\sqrt{2}$

Correct answer:

$5\sqrt{2}$

Explanation:

To find the diagonal of the square, we effectively cut the square into two $45^\circ:45^\circ:90^\circ$ triangles.

The pattern for the sides of a $45^\circ:45^\circ:90^\circ$ is $x:x:x\sqrt{2}$ .

Since two sides are equal to , this triangle will have sides of $5:5:5\sqrt{2}$ .

Therefore, the diagonal (the hypotenuse) will have a length of $5\sqrt{2}$ .

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

A square has sides of . What is the length of the diagonal of this square?

Possible Answers:

$12\sqrt{2}$

$6\sqrt{2}$

144

288

Correct answer:

$12\sqrt{2}$

Explanation:

To find the diagonal of the square, we effectively cut the square into two $45^\circ:45^\circ:90^\circ$ triangles.

The pattern for the sides of a $45^\circ:45^\circ:90^\circ$ is $x:x:x\sqrt{2}$ .

Since two sides are equal to , this triangle will have sides of $12:12:12\sqrt{2}$ .

Therefore, the diagonal (the hypotenuse) will have a length of $12\sqrt{2}$ .

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

What is the length of the diagonal of a square with a side length of ?

Possible Answers:

$\sqrt{72}$

$8\sqrt{2}$

Correct answer:

$8\sqrt{2}$

Explanation:

To find the diagonal of a square, we must use the side length to create a 90 degree triangle with side lengths of , , and a hypotenuse which is equal to the diagonal.

Pythagorean’s Theorem states , where a and b are the legs and c is the hypotenuse.

Take and and plug them into the equation for and : $8^{2}+8^{2}=c^{2}$

After squaring the numbers, add them together: 64+64=128

Once you have the sum, take the square root of both sides: $\sqrt{c^{2}}=\sqrt{128}$

Simplify to find the answer: $\sqrt{128}$ , or $8\sqrt{2}$ .

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

What is the length of the diagonal of a 7-by-7 square? (Round to the nearest tenth.)

Possible Answers:

9.9

12.5

7.8

Correct answer:

9.9

Explanation:

To find the diagonal of a square we must use the side lengths to create a 90 degree triangle with side lengths of 7 and a hypotenuse which is equal to the diagonal.

We can use the Pythagorean Theorem here to solve for the hypotenuse of a right triangle.

The Pythagorean Theorem states , where a and b are the sidelengths and c is the hypotenuse.

Plug the side lengths into the equation as and :

$7^{2}+7^{2}=c^{2}$

Square the numbers:

$49+49=c^{2}$

Add the terms on the left side of the equation together:

$98=c^{2}$

Take the square root of both sides:

$\sqrt{98}=\sqrt{c^{2}}$

9.9=c

Therefore the length of the diagonal is 9.9.

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

The perimeter of a square is 48. What is the length of its diagonal?

Possible Answers:

$\sqrt{12}$

$12\sqrt{2}$

$2\sqrt{12}$

$48\sqrt{2}$

$24\sqrt{2}$

Correct answer:

$12\sqrt{2}$

Explanation:

Perimeter = side * 4

48 = side * 4

Side = 12

We can break up the square into two equal right triangles. The diagonal of the sqaure is then the hypotenuse of these two triangles.

Therefore, we can use the Pythagorean Theorem to solve for the diagonal:

side^2 + side^2 = hypotenuse^2

12^2+12^2=hypotenuse^2

144 + 144=hypotenuse^2

$\sqrt{144+144}=\sqrt{hypotenuse^2}$

$hypotenuse=\sqrt{2\times 144}=\sqrt{2\times 12\times 12}=12\sqrt{2}$

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High School Math : How to find the length of the diagonal of a square

Study concepts, example questions & explanations for High School Math

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Example Questions

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

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

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

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

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

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

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