inscribed in a circle

Sound Focusing Theorem for the Hall where the Plan Is a n Regular Polygon Inscribed in a Circle

平面为圆内接正n边形（n为≥7的奇数）的厅堂声聚焦定理

By using the methods of mathematical analysis and analytic geometry, the maximum of triangle area with a fixed side inscribed in a circle is discussed.

利用数学分析结合解析几何的方法，解决了椭圆内接定边长三角形的面积最大值的问题。

Maximum of Triangle Area with Fixed Length of One Side Inscribed in a Circle

椭圆内接定边长三角形的面积最大值

Based on the reference [ 1], author presents and proves the sound focusing law for the hall, when the plan of the hall is a n regular polygon inscribed in a circle and the sound source is in the center of circle.

本文以参考文献[1]为基础，提出和论证了平面为圆内接正多边形且声源位于圆心时的厅堂声聚焦规律。

a property of close broken line inscribed in a circle--also solution to challenge (65)

垂心为其顶点的圆内接闭折线的一个性质--兼擂题（65）解答