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
도호기를 사용하여 구의 반지름을 측정할 수 있습니다.dohogireul sayonghayeo guui banjireumeul cheugjeonghal su itsseumnida.You can measure the radius of a sphere using a spherometer.