急!在线等答案!用英语回答的数学题.Usearulerand-查字典问答网

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　　急!在线等答案!用英语回答的数学题.Usearulerandaprotractortodraw3linesAB,BCandCDsuchthatBC⊥ABandBC⊥CD.AreABandCDparalleltoeachother?Explainyouranswerbriefly.

　　急!在线等答案!用英语回答的数学题.

　　Usearulerandaprotractortodraw3linesAB,BCandCDsuchthatBC⊥ABandBC⊥CD.AreABandCDparalleltoeachother?Explainyouranswerbriefly.

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2020-12-1818:08

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李剑宇

　　Yes,ifthethreelinesareinasurface,ABandCDparalleltoeachother.BecauseBC⊥AB,BC⊥CD,soitisarectangle,soABandCDparalleltoeachother.Ifthethreelinesarenotinasurface,ABa...

2020-12-18 18:11:21

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