MathemAttic: No. 2

Crux mathematicorum with mathematical mayhem

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DOI  :  

学科分类：数学（综合）

来源: Canadian Mathematical Society

【 摘 要 】

A rectangular sheet of paper is labelled ABCD, with AB being one ofthe longer sides. The sheet is folded so that vertex A is placed exactly on top ofthe opposite vertex C. The fold line is XY , where X lies on AB and Y lies onCD. Prove that the triangle CXY is isosceles.

【 授权许可】

CC BY