겉넓이 계산기
정육면체, 직육면체, 원기둥, 원뿔, 구의 겉넓이를 π를 사용해 정확하게, 각 부분을 보여 주며 구합니다.
결과
값을 입력하고 계산을 누르면 결과가 표시됩니다.
공식
Six rectangular faces, in three matching pairs.
Two circular ends plus the curved side.
The base plus the curved surface, using the slant height l.
Four times the area of a circle with the same radius.
이 계산기 사용법
- Choose the shape and enter its measurements in the same unit.
- Press Calculate. Areas come out in that unit squared.
풀이 예제
A cylinder with radius 3 and height 5
The two circular ends: 2π × 3² = 18π.
The curved side: 2π × 3 × 5 = 30π.
Total surface area = 18π + 30π = 48π ≈ 150.796447.
자주 묻는 질문
What is the difference between surface area and volume?
Surface area is the area of the outside (how much paint covers it); volume is the space inside (how much it holds).
What is the slant height of a cone?
The distance from the tip down the side to the edge of the base: l = √(r² + h²).