| 单词 | 九十度弧 |
| 释义 | 〔quadrant〕The plane area bounded by such an arc and two perpendicular radii.四分之一圆，扇形体：由九十度弧与两条垂直的半径围成的平面图形〔quadrant〕A circular arc of 90°; one fourth of the circumference of a circle.九十度弧；圆周的四分之一〔cavetto〕A concave molding with a cross section that approximates a quarter circle.飞檐的凹圆线脚：截面近于九十度弧的凹线脚 |
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