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Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
나도 수학쌤 문장제 문제를 변형해 문제를 내는 곳입니다.
[문장제 문제&개념응용] 원뿔의 겉넓이를 다른(?) 방법으로 구해보자.
khr519
2020.12.08 23:32
조회 349
원뿔의 밑면의 반지름을 r, 모선의 길이를 l 이라고 하자.(그러면 밑면의 원주는 2ㅠr (파이 기호가 없어서..)이다)
1)원뿔의 밑면의 넓이를 구하시오(식으로 나타내시오)
2)원뿔의 옆면에 페인트를 묻혀 굴리면 원이 생긴다. 이 원의 넓이를 식으로 나타내시오.
3)그렇다면 옆면의 넓이는 이 원의 넓이의 몇 배인지 구하고 간단한 풀이를 쓰시오.
4)옆면의 넓이를 구하시오
5){2),3),4)}의 과정을 하나의 식으로 나타내시오
6)원래 원뿔의 옆면의 넓이를 구하는 공식은 rl/2 이다. 5) 의 식을 변형해 rl/2로 만들 수 있는가?
(식으로 나타내라는 것은 r,l을 사용하여 나타내라는 것입니다)
(3~6 번은 풀이도 써주세요)
지금 바로
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