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在東北人民政府教育部編譯初級中學教科書「平面幾何」第一章末的練習,其中第20題是: 「若取任意四邊形上各邊的中點,做爲新組成四邊形的頂點,則新組成的四邊形是平行四邊形;求證在什麽條件下這平行四邊形爲: 1)矩形 2)菱形 3)正方形」 這題在新中國聯合出版社出版吳澡淥編輯「初中平面幾何參考書」
The Ministry of Education of the People’s Government of the People’s Republic of China compiles the exercises at the end of the first chapter of the textbook “Geometry of Planes” in the junior middle school textbooks. The 20th question is: “If you take the midpoints of the sides of any quadrilateral as the vertices of the newly formed quadrilateral, the new The quadrilateral is a parallelogram; verify under what conditions the parallelogram is: 1) Rectangle 2) Rhombus 3) Square This question was published in the New China Union Press by Wu Bath editor “Junior plane geometry reference book”