中文词源
diagonal 对角线的
dia-, 穿过。-gon, 弯，角，词源同knee, octagonal. 即穿过去的，成对角的。
英语词源
- diagonal
-
diagonal: [16] Diagonal is commonly used simply as a synonym for oblique, but in strict mathematical terms it denotes a line joining two non-adjacent angles of a polygon. This reveals far more clearly its origins. It comes from diagōnālis, a Latin adjective derived from Greek diagónios. This was a compound formed from the prefix dia- ‘across’ and gōníā ‘angle’ (as in English polygon), meaning ‘from angle to angle’. Gōníā is related ultimately to English knee and genuine.
=> genuine, knee, polygon - diagonal (adj.)
- 1540s (implied in diagonally), from Middle French diagonal, from Latin diagonalis, from diagonus "slanting line," from Greek diagonios "from angle to angle," from dia- "across" (see dia-) + gonia "angle" (see -gon). As a noun, from 1570s.
权威例句
- 1. The book has a diagonal black stripe on the cover.
- 书的封面上有条连接对角的黑斜线.
- 2. Footsteps had scored a diagonal path through the snow.
- 脚印在雪地上留下了一条对角线.
- 3. Draw a diagonal line to divide the square into two triangles.
- 画一条对角线,把正方形分成两个三角形.
- 4. The lumped mass matrix is a diagonal matrix.
- 集中质量阵是一个对用阵.
- 5. The square matrix is called a diagonal matrix.
- 该方矩阵称为对角矩阵.
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