Sansue = Japanese Math for Kids 「英語で算数」

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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J.19 Triangle and angle

In the figure, the point C is a point on the straight line BD.
When the length of the side AB is equal to the length of the side DE and the length of the side AC is equal to the length of side CD, find the degree of the angle of X.