원 계산기
원의 값 하나를 알고 있나요? 입력하면 반지름, 지름, 원주, 넓이를 구합니다.
결과
값을 입력하고 계산을 누르면 결과가 표시됩니다.
공식
Circumference is the distance around the circle.
Area is the space inside the circle.
이 계산기 사용법
- Choose which measurement you know and enter it.
- Press Calculate. Exact answers are given in terms of π, with decimals underneath.
풀이 예제
A circle with radius 5
Diameter = 2 × 5 = 10.
Circumference = 2π × 5 = 10π ≈ 31.415927. Area = π × 5² = 25π ≈ 78.539816.
자주 묻는 질문
Why is the answer written with π?
π is irrational, so “25π” is the exact answer. The decimal below it is rounded.
What units should I use?
Any unit works. Lengths come out in the same unit; area comes out in that unit squared.