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원의 넓이와 둘레

원의 넓이와 둘레 알기

원의 둘레를 무엇이라고 하나요? 원주
원주의 길이를 구하는 공식은? 지름 * 3.14
원의 넓이를 구하는 공식은? 반지름 * 반지름 * 3.14
굴렁쇠가 한 바퀴 굴러간 거리는 굴렁쇠의 무엇의 길이와 같은 가요? 원주
지름은 반지름의 몇 배 인가요? 2배
Created by: youngjin