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ISEE Upper Level Math : How to find the length of the diameter

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Example Questions

Example Question #1 : Circles

The area of a circle is $25\pi$ . Give the diameter and radius of the circle.

Possible Answers:

diameter = , radius =

diameter = , radius = 2.5

diameter = , radius =

Correct answer:

diameter = , radius =

Explanation:

The area of a circle can be calculated as $Area=\pi r^2$ where is the radius of the circle, and $\pi$ is approximately 3.14 .

$Area=\pi r^2\Rightarrow r^2=\frac{Area}{\pi}$

$\Rightarrow r=\sqrt{\frac{Area}{\pi}}=\sqrt{\frac{25 \pi}{\pi}}=\sqrt{25}\Rightarrow r=5$

To find the diameter, multiply the radius by :

$d=2r=2\times 5=10$

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Example Question #131 : Geometry

If the area of a circle is equal to $36\pi$ , then what is the diameter?

Possible Answers:

$6\pi$

$18\pi$

$12\pi$

$8\pi$

Correct answer:

Explanation:

If the area of a circle is equal to $36\pi$ , then the radius is equal to .

This is because the equation for the area of a circle is $\pi r^{2}$ .

Thus, $\pi r^{2}=36 \pi$ .

$r^{2}=36$

r=6

Then the diameter is 12.

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Example Question #3 : Circles

The circumference of a circle is $14\pi$ . Give the diameter of the circle.

Possible Answers:

$14\pi$

$4\pi$

Correct answer:

Explanation:

The circumference can be calculated as $C=2\pi r=\pi d$ , where is the radius of the circle and is the diameter of the circle.

$C=2\pi r=\pi d$

$d = \frac{C}{\pi }=\frac{14\pi }{\pi }=14$

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Example Question #4 : Circles

If the value of a radius is $x^{2}-^{\sqrt{x+4}}+2$ , what is the value of the diameter if the value of x=3 ?

Possible Answers:

$22-^{2\sqrt{7}$

$11-^{\sqrt{3}$

$22-^{\sqrt{14}$

$11-^{\sqrt{7}$

Correct answer:

$22-^{2\sqrt{7}$

Explanation:

If the value of a radius is $x^{2}-^{\sqrt{x+4}}+2$ , and the value of x=3 , then the radius will be equal to:

$3^{2}-^{\sqrt{3+4}}+2$

$9-^{\sqrt{7}}+2$

$11-^{\sqrt{7}$

Given that the diameter is twice that of the radius, the diameter will be equal to:

$2(11-^{\sqrt{7}})$

This is equal to:

$22-^{2\sqrt{7}$

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Example Question #2 : How To Find The Length Of The Diameter

A series of circles has the following radius values:

6, 9, 5, 4, 3

If the diameter is then calculated for this set, what would be the median diameter?

Possible Answers:

Correct answer:

Explanation:

The median is the middle number in a set when that set is ordered smalles to largest.

When 6, 9, 5, 4, 3 is ordered smallest to largest, we get 3, 4, 5, 6, 9

Here, the median would be .

Given that a diameter is twice the radius, the diamater would be (twice the value of ).

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Example Question #2 : How To Find The Length Of The Diameter

The circumference of a circle is $14\pi$ . Give the diameter of the circle.

Possible Answers:

$7\pi$

$8\pi$

Correct answer:

Explanation:

The circumference can be calculated as $Circumference =2\pi r=\pi d$ , where is the radius of the circle and is the diameter of the circle.

$Circumference =\pi d=14 \pi\Rightarrow d=\frac{14\pi}{\pi}=14$

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Example Question #141 : Geometry

You have a circular lens with a circumference of $16.67 \pi in$ , find the diameter of the lens.

Possible Answers:

3.14 in

16.67 in

12.45 in

8.33 in

Correct answer:

16.67 in

Explanation:

You have a circular lens with a circumference of $16.67 \pi in$ , find the diameter of the lens.

Begin with the circumference of a circle formula.

$C=2 \pi r$

Now, we know that

2r=d

Because our radius is half of our diameter.

So, we can change our original formula to be:

$C= \pi d$

Now, we can see that all we need to do is divide our circumference by pi to get our diameter.

$\frac{C}{\pi}=d$

Now plug in our known and solve:

$\frac{16.67 \pi in}{\pi}=d=16.67 in$

So our answer is 16.67inches

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Example Question #4 : How To Find The Length Of The Diameter

You are exploring the woods near your house, when you come across an impact crater. It is perfectly circular, and you estimate its area to be $169 \pi m^2$ .

What is the diameter of the crater?

Possible Answers:

19.5m

6.5m

52m

26m

Correct answer:

26m

Explanation:

You are exploring the woods near your house, when you come across an impact crater. It is perfectly circular, and you estimate its area to be $169 \pi m^2$ .

What is the diameter of the crater?

To solve this, we need to recall the formula for the area of a circle.

$A=\pi r^2$

Now, we know A, so we just need to plug in and solve for r!

$169 \pi m^2=\pi r ^2$

Begin by dividing out the pi

169m^2=r^2

Then, square root both sides.

$r=\sqrt{169m^2}=13m$

Now, recall that diameter is just twice the radius.

d=2r=13m (2)=26m

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Example Question #11 : Circles

The circumference of a circle is $14\pi$ . Give the diameter of the circle.

Possible Answers:

$14\pi$

$4\pi$

Correct answer:

Explanation:

The circumference can be calculated as $C=2\pi r=\pi d$ , where is the radius of the circle and is the diameter of the circle.

$C=2\pi r=\pi d$

$d = \frac{C}{\pi }=\frac{14\pi }{\pi }=14$

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All ISEE Upper Level Math Resources

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ISEE Upper Level Math : How to find the length of the diameter

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

All ISEE Upper Level Math Resources

Example Questions

Example Question #1 : Circles

Example Question #131 : Geometry

Example Question #3 : Circles

Example Question #4 : Circles

Example Question #2 : How To Find The Length Of The Diameter

Example Question #2 : How To Find The Length Of The Diameter

Example Question #141 : Geometry

Example Question #4 : How To Find The Length Of The Diameter

Example Question #11 : Circles

All ISEE Upper Level Math Resources

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