High School Math : Geometry

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #7 : How To Find The Circumference Of A Circle In Pre Algebra

If the diameter of a circle is , what is the circumference? 

Possible Answers:

Correct answer:

Explanation:

The formula for circumference is . The problem gives us the diameter instead of the radius, so we need to convert.

The diameter is twice the radius or .

This means that, for this circle, .

Divide both sides by :

Plug this value into our initial equation to solve:

Example Question #8 : How To Find The Circumference Of A Circle In Pre Algebra

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

Possible Answers:

Correct answer:

Explanation:

The formula for circumference of a circle is .

Plug in our given information and solve.

Example Question #9 : How To Find The Circumference Of A Circle In Pre Algebra

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

Possible Answers:

Correct answer:

Explanation:

The formula for circumference of a circle is .

Plug in our given values.

Example Question #10 : How To Find The Circumference Of A Circle In Pre Algebra

What is the circumference of a circle with radius of ?

Possible Answers:

Correct answer:

Explanation:

The formula for circumference of a circle is .

Plug in our given values.

 

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

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

Possible Answers:

Correct answer:

Explanation:

The formula for circumference of a circle is .

Plug in our given values.

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

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

Possible Answers:

Correct answer:

Explanation:

The formula for the circumference is .

Plug in our given radius and solve.

Example Question #41 : Geometry

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

Possible Answers:

Correct answer:

Explanation:

To find the circumference of a circle given the radius we must first know the equation for the circumference of a circle which is 

We then plug in the number for the radius into the equation yielding

 

We multiply to find the value for the circumference is .

The answer is .

Example Question #42 : Geometry

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

Possible Answers:

Correct answer:

Explanation:

To find the circumference of a circle we must first know the equation for the circumference of a circle, which is .

We then plug in the given value for the radius, yielding .

We multiply to find the value for the circumference is .

Thus answer is .

Example Question #43 : Geometry

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

Possible Answers:

Correct answer:

Explanation:

To find the circumference of a circle given the radius, we must first know the equation for the circumference of a circle which is

We then plug in  for the radius into the equation yielding 

We multiply to find the value for the circumference is

The answer is .

Example Question #46 : Perimeter Of A Figure

Find the circumference of a circle with a diameter of 4 meters. 

Possible Answers:

 meters 

 meters 

 meters 

 meters

 meters 

Correct answer:

 meters 

Explanation:

The formula for circumference is: 

 where  is the radius of our circle 

In this case, we were given the diameter of  meters. Thus, we know that the radius is  meters (since the diameter is twice the radius). Plugging this into the formula, we have: 

 meters. 

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