| 平面角为锐角的投影等于原角的条件及证明 |
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| 引用本文： | 许有伦. 平面角为锐角的投影等于原角的条件及证明[J]. 广东工业大学学报, 1993, 0(4) |
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| 作者姓名： | 许有伦 |
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| 作者单位： | 广东工学院基础部 |
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| 摘 要： | 本文提出平面角的水平投影与其空间角相等时新的作图方法。
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| 关 键 词： | 平面角 水平投影 锐角 |
The Condition and Proof Used When the Horizontal Projection of the Plane Angle Equals Its Space Angle |
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| Xu Youlun. The Condition and Proof Used When the Horizontal Projection of the Plane Angle Equals Its Space Angle[J]. Journal of Guangdong University of Technology, 1993, 0(4) |
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| Authors: | Xu Youlun |
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| Affiliation: | Dept. of Basic Courses |
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| Abstract: | This paper provides a new construction method used when the horizontal projection of the plane angle is equal to its space angle. |
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| Keywords: | plane angle horizontal projection aeute angle |
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