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 3) : Right dodecagon (JJJ14)
Answer the following questions about a right dodecagon.
(1) Find the number of a diagonal line.
(2) Write in all the right dodecagons that have every side on the dotted line in the figure.
