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Basic Geometry : How to find the length of the diagonal of a rectangle

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Example Question #11 : How To Find The Length Of The Diagonal Of A Rectangle

Find the length of the diagonal of a rectangle that has a length of and a width of .

Possible Answers:

$15\sqrt{29}$

$16\sqrt{3}$

Correct answer:

Explanation:

The diagonal of a rectangle is also the hypotenuse of a right triangle that has the length and the width of the rectangle as its legs.

We can then use the Pythgorean Theorem to find the diagonal.

$\text{Diagonal}=\sqrt{\text{length}^2+\text{width}^2}$

For the given rectangle,

$\text{Diagonal}=\sqrt{13^2+84^2}=\sqrt{7225}=85$

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Example Question #12 : How To Find The Length Of The Diagonal Of A Rectangle

Find the length of the diagonal of a rectangle that has a length of and a width of .

Possible Answers:

$6\sqrt3$

$2\sqrt{5}$

$\sqrt{13}$

$\sqrt{7}$

Correct answer:

$\sqrt{13}$

Explanation:

The diagonal of a rectangle is also the hypotenuse of a right triangle that has the length and the width of the rectangle as its legs.

We can then use the Pythgorean Theorem to find the diagonal.

$\text{Diagonal}=\sqrt{\text{length}^2+\text{width}^2}$

For the given rectangle,

$\text{Diagonal}=\sqrt{2^2+3^2}=\sqrt{13}$

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Example Question #13 : How To Find The Length Of The Diagonal Of A Rectangle

Find the length of the diagonal of a rectangle that has a length of and a width of .

Possible Answers:

$2\sqrt{13}$

$2\sqrt{17}$

$2\sqrt{19}$

$2\sqrt{15}$

Correct answer:

$2\sqrt{17}$

Explanation:

The diagonal of a rectangle is also the hypotenuse of a right triangle that has the length and the width of the rectangle as its legs.

We can then use the Pythgorean Theorem to find the diagonal.

$\text{Diagonal}=\sqrt{\text{length}^2+\text{width}^2}$

For the given rectangle,

$\text{Diagonal}=\sqrt{8^2+2^2}=\sqrt{68}=2\sqrt{17}$

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Example Question #14 : How To Find The Length Of The Diagonal Of A Rectangle

Find the length of the diagonal of a rectangle that has a length of and a width of .

Possible Answers:

$\sqrt{29}$

$3\sqrt3$

$\sqrt{31}$

Correct answer:

$\sqrt{29}$

Explanation:

The diagonal of a rectangle is also the hypotenuse of a right triangle that has the length and the width of the rectangle as its legs.

We can then use the Pythgorean Theorem to find the diagonal.

$\text{Diagonal}=\sqrt{\text{length}^2+\text{width}^2}$

For the given rectangle,

$\text{Diagonal}=\sqrt{5^2+2^2}=\sqrt{29}$

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Example Question #15 : How To Find The Length Of The Diagonal Of A Rectangle

Find the length of the diagonal of a rectangle that has a length of and a width of .

Possible Answers:

$2\sqrt{31}$

$6\sqrt3$

$2\sqrt{29}$

Correct answer:

$2\sqrt{29}$

Explanation:

The diagonal of a rectangle is also the hypotenuse of a right triangle that has the length and the width of the rectangle as its legs.

We can then use the Pythgorean Theorem to find the diagonal.

$\text{Diagonal}=\sqrt{\text{length}^2+\text{width}^2}$

For the given rectangle,

$\text{Diagonal}=\sqrt{4^2+10^2}=\sqrt{116}=2\sqrt{29}$

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Example Question #13 : How To Find The Length Of The Diagonal Of A Rectangle

Find the length of the diagonal of a rectangle that has a length of and a width of .

Possible Answers:

$\sqrt{110}$

$\sqrt{178}$

$\sqrt{221}$

$\sqrt{222}$

Correct answer:

$\sqrt{221}$

Explanation:

The diagonal of a rectangle is also the hypotenuse of a right triangle that has the length and the width of the rectangle as its legs.

We can then use the Pythgorean Theorem to find the diagonal.

$\text{Diagonal}=\sqrt{\text{length}^2+\text{width}^2}$

For the given rectangle,

$\text{Diagonal}=\sqrt{10^2+11^2}=\sqrt{221}$

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Example Question #16 : How To Find The Length Of The Diagonal Of A Rectangle

Find the length of the diagonal of a rectangle that has a width of and length of ?

Possible Answers:

$2\sqrt{85}$

$2\sqrt{87}$

$2\sqrt{83}$

Correct answer:

$2\sqrt{85}$

Explanation:

The diagonal of a rectangle is also the hypotenuse of a right triangle that has the length and the width of the rectangle as its legs.

We can then use the Pythgorean Theorem to find the diagonal.

$\text{Diagonal}=\sqrt{\text{length}^2+\text{width}^2}$

For the given rectangle,

$\text{Diagonal}=\sqrt{14^2+12^2}=\sqrt{340}=2\sqrt{85}$

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Example Question #17 : How To Find The Length Of The Diagonal Of A Rectangle

Find the length of the diagonal of a rectangle that has a length of and a width of .

Possible Answers:

$6\sqrt{11}$

$18\sqrt3$

$4\sqrt{17}$

$12\sqrt2$

Correct answer:

$4\sqrt{17}$

Explanation:

The diagonal of a rectangle is also the hypotenuse of a right triangle that has the length and the width of the rectangle as its legs.

We can then use the Pythgorean Theorem to find the diagonal.

$\text{Diagonal}=\sqrt{\text{length}^2+\text{width}^2}$

For the given rectangle,

$\text{Diagonal}=\sqrt{4^2+16^2}=\sqrt{272}=4\sqrt{17}$

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Example Question #11 : How To Find The Length Of The Diagonal Of A Rectangle

Find the length of the diagonal of a rectangle whose length is 5 and width is 3.

Possible Answers:

$\sqrt{34}$

$\sqrt{15}$

Correct answer:

$\sqrt{34}$

Explanation:

To solve, simply use the pythagorean theorem. Thus,

$c^2=a^2+b^2\Rightarrow c=\sqrt{a^2+b^2}$

$c=\sqrt{5^2+3^2}=\sqrt{25+9}=\sqrt{34}$

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Example Question #19 : How To Find The Length Of The Diagonal Of A Rectangle

A rectangle is inscribed in a circle. If the circumference of the circle is $5\pi$ , what is the length of the diagonal of the rectangle?

Possible Answers:

Correct answer:

Explanation:

You should notice that the diagonal of the rectangle is the same as the diameter of the circle.

Now, recall how to find the circumference of a circle.

$\text{Circumference}=\text{diameter}\times\pi$

Since we are given the circumference and need the diameter, rerwite the equation to solve for the diameter.

$\text{Diameter}=\frac{\text{Circumference}}{\pi}$

Plug in the given circumference to find the diameter.

$\text{Diameter}=\frac{5\pi}{\pi}=5$

Now, recall the relationship between the diameter of the circle and the diagonal of the rectangle:

$\text{Diameter}=\text{Diagonal}=5$

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Basic Geometry : How to find the length of the diagonal of a rectangle

Study concepts, example questions & explanations for Basic Geometry

All Basic Geometry Resources

Example Questions

Example Question #11 : How To Find The Length Of The Diagonal Of A Rectangle

Example Question #12 : How To Find The Length Of The Diagonal Of A Rectangle

Example Question #13 : How To Find The Length Of The Diagonal Of A Rectangle

Example Question #14 : How To Find The Length Of The Diagonal Of A Rectangle

Example Question #15 : How To Find The Length Of The Diagonal Of A Rectangle

Example Question #13 : How To Find The Length Of The Diagonal Of A Rectangle

Example Question #16 : How To Find The Length Of The Diagonal Of A Rectangle

Example Question #17 : How To Find The Length Of The Diagonal Of A Rectangle

Example Question #11 : How To Find The Length Of The Diagonal Of A Rectangle

Example Question #19 : How To Find The Length Of The Diagonal Of A Rectangle

All Basic Geometry Resources

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