acute triangle

1. A difference replacement demonstration of the geometric inequalities of acute triangle and the corresponding application program
   锐角三角形几何不等式的差分代换证法及应用程序
2. Every day I feel the sun in the window, shadows, traffic, and changes in acute triangle.
   我每天在窗口感受到阳光、影子、车流和锐角三角形的变化。

noun

1. a triangle whose interior angles are all acute

   Synonym:    acute-angled triangle