Дано: ВD = 3,1см, ВЕ = 4,2см,

ВА = 9,3см, ВС = 12,6см.

Доказать: DЕ || АС.

Найти: а) DЕ : АС; б) РАВС : РDВЕ; в) SDВЕ : SАВС.
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