This site introduces problems of Sansue, i.e. mathematics which Japanese schoolchildren learn at elementary school. Problems are selected mainly from entrance examinations of famous junior high schools for 6th grade Japanese schoolchildren (12 years old) to take. We found Sansue is not only one of subjects at school but one of Japanese culture. Please enjoy Japanese Sansue culture.
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Math Problem (Level 2) : Cut line on the development view (KK20)
As for the cube in a figure, the points P and Q are middle points of the side AB and AD, respectively.
This cube was cut by the plane which passes along the three points P, Q, and G, and the side PQ was drawn as a part of the cut surface.
Draw other sides of the cut surface in a development view.