2019. 2. 5.

2018. 12. 26.

古건축가 신영훈은 누구인가 [출처: 중앙일보]

https://news.joins.com/article/3618651


http://lady.khan.co.kr/khlady.html?mode=view&code=4&artid=201004131642371


http://biz.heraldcorp.com/common_prog/newsprint.php?ud=20130226000944

2018. 11. 5.


원 둘레 구하기

http://mwultong.blogspot.com/2008/03/circle-calc-circumference.html

원 면적 구하기

http://mwultong.blogspot.com/2008/03/circle-area-calc.html