두 원의 공통 내접선 작도하기(Constructing two circles' inner tangents)

문제(Problem)

답(Solution)

두 원의 공통 내접선 작도하기(Constructing two circles' inner tangents) : https://goo.gl/vFbzrS YouTube : https://youtu.be/qr2iS5t86jo GeogebraTube : https://ggbm.at/meKaRJPH ggb problem : http://me2.do/FDTy9hdP 기하작도문제 : https://ggbm.at/jFazZw2g 수학자료실 강의실 : https://goo.gl/czyJLW YouTube Channel : https://goo.gl/JpzU5i twitter : https://twitter.com/mineungi