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수학과 교육 2015년 1-2월호(108호) : 지오지브라 5를 활용하여 입체의 형태 예상하기(2) -1
[math]0 \leq x \leq \frac{\pi}{2}[/math] 일 때, 두 점 [math]P ( x , 0 , cos^{2}x )[/math] , [math]Q ( x , 1 - sin(x) , 0 )[/math] 을 연결하는 직선이 움직여 생기는 곡면과 세 좌표평면으로 둘러싸인 입체의 모양을 관찰할 수 있습니다.