Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
구면계를 사용하여 곡면의 곡률을 측정할 수 있습니다.gumyeonggye-reul sayonghayeo gokmyeon-ui gokryul-eul cheugjeonghal su itsseumnida.You can use a spherometer to measure the curvature of a surface.