※ 引述《smilepoch (漢彌爾頓 車～壞～掉～了)》之銘言：
: Given a quadrilateral of any irregular form.
: Draw four squares, one for each side of the quadrilateral,
: out from the given quadrilateral.
: Find the center points of each square.
: Draw lines between the center points of opposite squares.
: Show that these two lines are equal in length
: and cross each other right-angled."
: Proof?
這個月初
是講到關於"triangle"的
但此篇講到的是"四邊形"
http://agutie.homestead.com/files/vanaubel.html
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 61.58.103.35
※ 文章網址: https://www.ptt.cc/bbs/Math/M.1472177328.A.49A.html
※ 編輯: wayne2011 (61.58.103.35), 08/26/2016 15:24:18