三个接收天线（接收闪电放电辐射的超高频脉冲）分别放在一个垂直边长为120米的直角等腰三角形的顶点，由到达天线的时间差来计算接收到的闪电脉冲的方向。
The three antennas which receive VHF impulses emitted by a lightning discharge are placed on the vertices of a right-angled isosceles triangle with perpendicular sides 120 meters in length.
当实现对等边三角形和等腰三角形的测试时，我认识到我只用了delta值来用于直角三角形的计算。
As I implemented the tests for equilateral and isosceles triangles, I realized that I was using only the delta value for calculations in right triangles.
本文用逐步递降法的思想证明了不存在边长和中线都是整数的直角三角形和等腰三角形。
In this paper it is proved that there exist neither right triangles nor isosceles triangles with integer sides and medians by the method of descending.
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