[3차시]평행을 알아볼까요(수90-91p, 수익56-57p)
https://docs.google.com/presentation/d/1okWLZiQps2cw8KmWio8KOY5Q1ZJAdN1gNkrMeHUgDNA/copy#slide=id.p1
[3차시]평행을 알아볼까요(수90-91p, 수익56-57p)
https://docs.google.com/presentation/d/1okWLZiQps2cw8KmWio8KOY5Q1ZJAdN1gNkrMeHUgDNA/copy#slide=id.p1