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High School Math : High School Math

Study concepts, example questions & explanations for High School Math

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All High School Math Resources

8 Diagnostic Tests 613 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #751 : High School Math

What is the area of a circle with a radius of ?

Possible Answers:

$A=12\pi$

$A=188\pi$

$A=144\pi$

$A=24\pi$

Correct answer:

$A=144\pi$

Explanation:

To find the area of a circle you must plug the radius into in the following equation

In this case the radius is so we plug it into to get

$A=12^{2}\pi$

We then multiply it by to get our answer

$A=144\pi$ .

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Example Question #17 : How To Find The Area Of A Circle In Pre Algebra

What is the area of a circle with a radius of ?

Possible Answers:

$A=7\pi$

$A=42\pi$

$A=14\pi$

Correct answer:

Explanation:

To find the area of a circle you must plug the radius into in the following equation

In this case the radius is so we plug it into to get

We then multiply it by to get our answer .

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Example Question #751 : High School Math

What is the radius of a circle with an area of $144\pi$ ?

Possible Answers:

144

Correct answer:

Explanation:

The formula for the area of a circle is $A=\pi r^2$ .

Plug in our given values.

$A=\pi r^2$

$144\pi=\pi r^2$

Notice the $\pi$ 's cancel out.

144=r^2

$\sqrt{144}=\sqrt{r^2}$

12=r

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Example Question #471 : Pre Algebra

What is the diameter of a circle with an area of $169\pi$ ?

Possible Answers:

84.5

$13\pi$

$26\pi$

Correct answer:

Explanation:

The formula for the area of a circle is $A=\pi r^2$ .

Plug in our given values.

$A=\pi r^2$

$169\pi=\pi r^2$

Notice that the pi cancels out.

169=r^2

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

13=r

The diameter is twice the radius or d=2r .

For this circle that means that d=2*13=26 .

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Example Question #751 : High School Math

What is the area of circle with a radius of ?

Possible Answers:

$70\pi$

$49\pi$

$7\pi$

$14\pi$

Correct answer:

$49\pi$

Explanation:

To find the area of a circle, use the equation:

$Area=\pi(radius^{2})$

Substitute the given value for radius:

$Area=\pi(7^{2})$

$Area=49\pi$

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Example Question #752 : High School Math

Find the area of a circle with a radius of 12 inches.

Possible Answers:

$24\pi \ in^{2}$

$144\pi \ in^{2}$

$112\pi \ in^{2}$

$12\pi \ in^{2}$

$48\pi \ in^{2}$

Correct answer:

$144\pi \ in^{2}$

Explanation:

The formula for the area of a circle is $A=\pi r^2$ .

Plug your radius value in and you get $144\pi$ .

Make sure your units are squared.

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Example Question #753 : High School Math

What is the area of a circle with diameter ?

Possible Answers:

$6\pi$

$3\pi$

$9\pi$

$12\pi$

Correct answer:

$9\pi$

Explanation:

The area of a circle is calculated with the equation $A=\pi r^2$ .

is half of the diameter, which in our case is 3.

$A=\pi r^2= (3)^2\pi=9\pi$

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Example Question #754 : High School Math

Find the area of a circle with a radius of 7 inches.

Possible Answers:

$117\pi \ in^{2}$

$149\pi \ in^{2}$

$7\pi \ in^{2}$

$14\pi \ in^{2}$

$49\pi \ in^{2}$

Correct answer:

$49\pi \ in^{2}$

Explanation:

Use the formula for the area of a circle, $A=\pi r^{2}$ , and plug in 7 for the radius to get $49\pi$ . Make sure your answer is in units squared.

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Example Question #755 : High School Math

Find the area of a circle with a circumference of $26\pi$ .

Possible Answers:

$169\pi$

$52\pi$

225

$13\pi$

$26\pi$

Correct answer:

$169\pi$

Explanation:

The circumference equation is $C = 2\pi r$

If we plug $26\pi$ into the equation, we can solve for the radius, which is .

Now, we look for the area of the circle based on the equation $A = \pi r^{2}$

$A = 169\pi$

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Example Question #25 : How To Find The Area Of A Circle In Pre Algebra

The area of a circle is $49 \pi$ . What is its radius?

Possible Answers:

3.5

Correct answer:

Explanation:

Here, we are given the area of a circle and asked to solve for the radius. We know that the formula for the area of a circle is $A = \pi(r)^{2}$

Plugging in the area, we can cancel out the pi on each side of the equation, so that

$r^{2} = 49$

Taking the square root, we find that r = 7

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High School Math : High School Math

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #751 : High School Math

Example Question #17 : How To Find The Area Of A Circle In Pre Algebra

Example Question #751 : High School Math

Example Question #471 : Pre Algebra

Example Question #751 : High School Math

Example Question #752 : High School Math

Example Question #753 : High School Math

Example Question #754 : High School Math

Example Question #755 : High School Math

Example Question #25 : How To Find The Area Of A Circle In Pre Algebra

All High School Math Resources

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