[5차시]사다리꼴을 알아볼까요(수94-95p, 수익60-61p)
https://docs.google.com/presentation/d/1SmMUGmKTfok6wtYrcsRHR1imw1FvHtMeaA2JOPQRS9I/copy#slide=id.p11
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[5차시]사다리꼴을 알아볼까요(수94-95p, 수익60-61p)
https://docs.google.com/presentation/d/1SmMUGmKTfok6wtYrcsRHR1imw1FvHtMeaA2JOPQRS9I/copy#slide=id.p11