Circle Area & Circumference Practice (Free)
Practice the area and circumference of circles with this free tool. Given a radius or diameter, find the area (πr²) or circumference (2πr) in terms of π — the tool checks your answer and shows the formula.
How the practice works
- Pick a difficulty.
- Find the area or circumference and press Check.
- Read the feedback and step-by-step solution, then press Next.
The formulas
Area = πr²; Circumference = 2πr. Answers are given in terms of π (for example 36π), and the decimal form using π ≈ 3.14 is also accepted.
Original price was: $109.99.$54.99Current price is: $54.99.
Frequently asked questions
What are the circle formulas?
Area = πr² and circumference = 2πr, where r is the radius.
How do I enter the answer?
In terms of π (like 36π) — the decimal form using π ≈ 3.14 is accepted too.
Original price was: $109.99.$54.99Current price is: $54.99.
Is it free?
Yes — unlimited problems, no sign-up, with progress saved in your browser.
Original price was: $109.99.$54.99Current price is: $54.99.
Read the full lesson: learn the method step by step.
Original price was: $27.99.$17.99Current price is: $17.99.
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