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Circumference and Area of Circles Calculator

QUICK LINKS


Circumference and Area of Circles Calculator

Circumference and Area of Circles

CALCULATOR
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Circumference & Area of Circles Calculator

Step 1. Identify the unknown.

What are you trying to solve for?
pizza

Step 2. Identify the given.

What is the value of the ?

Step 3. Select the correct formula(s).

We can use the following formula(s) to solve for the circumference using the area:

Step 4. Plug in the given and solve for the unknown.

(1) Since there isn’t an equation that takes us directly from area to circumference, we first have to solve for the radius:
(2) Now that we know the radius is equal to, we can plug it into the second equation to solve for the circumference:
Our answer is .
We have some questions for you! Help us out through this
INTRO
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Remembering all the different parts of a circle and what they represent can sometimes feel a little out of reach. That’s why we like to think about them in terms of our favorite type of circle...pizza!
These are different formulas we can use to find these different values:
Circle PartPizzaFormula
CircumferenceCrust
AreaAmount of Pizza
DiameterDistance Across
RadiusSlice Length
Check out our
Calculator
or explore our
Lesson
and
Practice
sections to learn more about circles and test your understanding.

You can also use the Quick Links menu on the left to jump to a section of your choice.

You can also use the Quick Links dropdown above to jump to a section of your choice.

KEY STEPS
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How to Find Circumference & Area of Circles

Step 1. Identify the unknown.

What are you trying to solve for?
Since the unknown is the circumference, you need to solve for the distance around the circle, which is like the crust of a pizza.

Step 2. Identify the given.

What information do you already have?

Step 3. Select the correct formula(s).

You can use the following formula(s) to solve for the circumference the given the radius:

Step 4. Plug in the given and solve for the unknown.

Plug in the given value into the formula and solve for the unknown using inverse operations as needed.
LESSON
β€” Diameter Formula
PRACTICE
β€” Diameter Formula
LESSON
β€” Circumference Formula
PRACTICE
β€” Circumference Formula
LESSON
β€” Area Formula
PRACTICE
β€” Area Formula
CONCLUSION
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