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--- Shapes and Geometry
球体
kyūtai
sphere
体 [body]
Ref. 球 [ball]
半周
hanshū
semicircle
Ref. 周 [lap]
円周
enshū
circumference
Ref. 周 [lap]
直径
chokkei
diameter
直 [straight]
Ref. 径 [path]
直線
chokusen
straight line
線 [line]
Ref. 直 [straight]