When considered within a plane, two line segments that can be superimposed are said to be of equal length. Now, fix one line segment OE, and use it as a unit to correspond to a positive real value that represents the length of the other line segments. To do this, as in (1) of [Osamu Takenouchi] Curve Length When there are two points A and B on a curve L, the length between A and B on L is defined as follows. Take a number of points between A and B on L, and call them P 1 , P 2 , …, P n-1 (A=P 0 , B=P n ), in that order (see (2) in [Osamu Takenouchi] ©Shogakukan "> Length of straight lines and curves (Diagram) Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
平面内で考えたとき、重ね合わすことのできる二つの線分を、長さが等しいという。いま、ある一つの線分OEを固定して、これを単位として他の線分の長さを表す正の実数値を対応させる。このためには、 [竹之内脩] 曲線の長さ曲線L上に2点A、Bがあるとき、LのA、Bの間の長さは、次のように定める。L上、A、B間に数多くの点をとり、それらを順にP1,P2,……,Pn-1(A=P0,B=Pnとする)とする( [竹之内脩] ©Shogakukan"> 直線、曲線の長さ〔図〕 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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