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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 #741 : High School Math

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

Possible Answers:

$5\pi$

$25\pi$

$\frac{5}{\pi}$

$\frac{25}{2}\pi$

$10\pi$

Correct answer:

$25\pi$

Explanation:

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

Plug in our given information:

$A=\pi*5^2$

$A=25\pi$

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Example Question #742 : High School Math

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

Possible Answers:

$36\pi^2$

$36\pi$

$\frac{1}{6}\pi$

$6\pi$

$12\pi$

Correct answer:

$36\pi$

Explanation:

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

Plug in our given information:

$A=\pi 6^2$

$A=36\pi$

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Example Question #3 : How To Find The Area Of A Circle In Pre Algebra

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

Possible Answers:

$484\pi$

$22\pi$

$11\pi$

$11\pi^2$

$121\pi$

Correct answer:

$121\pi$

Explanation:

The formula for area of a circle is $A=\pi r^2$ . However, the problem gives us the diameter instead of the radius. The diameter is twice the length of the radius:

d=2r

22=2r

$\frac{22}{2}=r$

11=r

We can plug that back into our area equation:

$A=\pi r^2$

$A=\pi *11^2$

$A=121\pi$

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Example Question #5 : How To Find The Area Of A Circle In Pre Algebra

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

Possible Answers:

$12\pi$

$144\pi$

$\frac{1}{2}\pi$

$6\pi$

$36\pi$

Correct answer:

$36\pi$

Explanation:

The formula for area of a circle is $A=\pi r^2$ . However, the problem gives us the diameter instead of the radius. The diameter is twice the length of the radius:

d=2r

12=2r

$\frac{12}2{}=r$

6=r

We can plug that back into our original equation and solve:

$A=\pi r^2$

$A=\pi *6^2$

$A=36\pi$

Report an Error

Example Question #11 : How To Find The Area Of A Circle In Pre Algebra

What is the area of a circle with a radius of 2.5 ?

Possible Answers:

$6.25\pi$

$1.25\pi$

$3.125\pi$

$5\pi$

$7.5\pi$

Correct answer:

$6.25\pi$

Explanation:

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

Plug in our given radius.

$A=\pi r^2$

$A=\pi *2.5^2$

$A=6.25\pi$

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Example Question #11 : How To Find The Area Of A Circle In Pre Algebra

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

Possible Answers:

$64\pi$

$16\pi$

$4\pi$

$32\pi$

$8\pi$

Correct answer:

$64\pi$

Explanation:

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

Plug in our radius.

$A=\pi r^2$

$A=\pi *8^2$

$A=\pi*64$

$A=64\pi$

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Example Question #13 : How To Find The Area Of A Circle In Pre Algebra

What is the area of a circle with diameter of ?

Possible Answers:

$4\pi$

$16\pi$

$64\pi$

$8\pi$

$32\pi$

Correct answer:

$16\pi$

Explanation:

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

The problem gives us the diameter, however, and not the radius. Since the diameter is twice the radius ( d=2r ), then if the diameter is , the radius will be .

Plug that into our given equation.

$A=\pi r^2$

$A=\pi (4)^2$

$A=\pi*16$

$A=16\pi$

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Example Question #12 : How To Find The Area Of A Circle In Pre Algebra

What is the area of a circle with diameter of ?

Possible Answers:

$256\pi$

$16\pi$

$32\pi$

$64\pi$

Correct answer:

$64\pi$

Explanation:

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

The problem gives us the diameter, however, and not the radius. Since the diameter is twice the radius ( d=2r ), if the diameter is , the radius will be .

Plug this value into our given equation:

$A=\pi r^2$

$A=\pi (8)^2$

$A=\pi*64$

$A=64\pi$

Report an Error

Example Question #13 : How To Find The Area Of A Circle In Pre Algebra

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

Possible Answers:

$A=12\pi$

$A=8\pi$

$A=16\pi$

$A=4\pi$

Correct answer:

$A=16\pi$

Explanation:

To find the area of a circle, you must plug the radius in for in the following equation:

In this case the radius is , so we plug in for to get $A=\pi(4^{2})$ .

$A=16\pi$

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Example Question #14 : How To Find The Area Of A Circle In Pre Algebra

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

Possible Answers:

$7\pi$

$49\pi$

$196\pi$

$196\pi^2$

Correct answer:

$49\pi$

Explanation:

The formula for area of a circle is $A=\pi r^2$ , but the problem gives us the diameter and not the radius.

The diameter is twice the radius, so 14=2r . Therefore 7=r .

Plug this value into our given equation.

$A=\pi r^2$

$A=\pi (7)^2$

$A=\pi *49$

$A=49\pi$

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All High School Math Resources

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

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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 #741 : High School Math

Example Question #742 : High School Math

Example Question #3 : How To Find The Area Of A Circle In Pre Algebra

Example Question #5 : How To Find The Area Of A Circle In Pre Algebra

Example Question #11 : How To Find The Area Of A Circle In Pre Algebra

Example Question #11 : How To Find The Area Of A Circle In Pre Algebra

Example Question #13 : How To Find The Area Of A Circle In Pre Algebra

Example Question #12 : How To Find The Area Of A Circle In Pre Algebra

Example Question #13 : How To Find The Area Of A Circle In Pre Algebra

Example Question #14 : How To Find The Area Of A Circle In Pre Algebra

All High School Math Resources

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