High School Math : How to find the area of a circle in pre-algebra

Study concepts, example questions & explanations for High School Math

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Example Questions

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Example Question #751 : High School Math

What is the area of circle with a radius of ?

Possible Answers:

Correct answer:

Explanation:

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

Substitute the given value for radius:

Example Question #752 : High School Math

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

Possible Answers:

Correct answer:

Explanation:

The formula for the area of a circle is .

Plug your radius value in and you get .

Make sure your units are squared.

Example Question #23 : How To Find The Area Of A Circle In Pre Algebra

What is the area of a circle with diameter ?

Possible Answers:

Correct answer:

Explanation:

The area of a circle is calculated with the equation .

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

Example Question #753 : High School Math

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

Possible Answers:

Correct answer:

Explanation:

Use the formula for the area of a circle, , and plug in 7 for the radius to get . Make sure your answer is in units squared. 

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

Find the area of a circle with a circumference of .

Possible Answers:

Correct answer:

Explanation:

The circumference equation is 

If we plug  into the equation, we can solve for the radius, which is .

 

Now, we look for the area of the circle based on the equation 

Example Question #26 : How To Find The Area Of A Circle In Pre Algebra

The area of a circle is  . What is its radius? 

Possible Answers:

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

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

Taking the square root, we find that 

Example Question #761 : High School Math

Find the diameter of a circle with an area of .

Possible Answers:

Correct answer:

Explanation:

The area formula is 

Plugging in the given number for A, we can solve for the radius and find that the radius is 8.

The diameter is twice the radius, so the diameter is .

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