[6차시]평행사변형을 알아볼까요(수96-97p, 수익62-63p)
https://docs.google.com/presentation/d/1RL6DC21sM-Y4FvnRJO6iIkuGQLH9mw-KnDHAQmpovL4/copy#slide=id.p3
[6차시]평행사변형을 알아볼까요(수96-97p, 수익62-63p)
https://docs.google.com/presentation/d/1RL6DC21sM-Y4FvnRJO6iIkuGQLH9mw-KnDHAQmpovL4/copy#slide=id.p3