名词
中文翻译：半角形角度
同义词：
['semi-angle', 'semi-perimeter']
例句：
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1. The triangle has a semi-angle of 60 degrees.
这个三角形有一个60度的半角。
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2. Theperimeter of the circle is twice theradius, which is a semi-perimeter of 36 units.
圆的周长是半径的两倍，即半周长为36单位。
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3. In geometry, a semi-angle is defined as an angle whose measureis less than 90 degrees butgreater than 45 degrees.
在几何学中，一个半角定义为一个小于90度但大于45度的角。