Disc - Enban (English spelling) disc

Japanese: 円板 - えんばん（英語表記）disc
Disc - Enban (English spelling) disc
It is also called a disk. Strictly speaking, a circle refers to the curved perimeter, so to distinguish it from that, the area inside the circle is called a disk. However, in everyday life, the word "yen" is often used to mean "disc," as in "The area of ​​a circle is π r 2 ."

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
円盤ともいう。円というのは，正確には，周辺の曲線をさすので，それと区別するためには，円の内部の領域のほうを円板という。しかし，日常的には，「円の面積は πr2 」のように，「円板」の意味に「円」を使うことも多い。

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