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Problem of Two Tapes 兩條膠貼紙

Author:
Alex CHIK
Topic:
Plane Figures or Shapes, Rhombus

兩條相交的膠貼紙的重疊部分是哪類特殊四邊形?

If two pieces of scotch tape of same width overlap each other, what type of quadrilateral is the overlapping region?
Source: http://www.ies-math.com/math/java/geo/twotapes/twotapes.html GeoGebra 互動數學教室 http://www.geogebra.hk

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