equilateral circular triangle

例句：

1. 1.The equilateral triangle is the shape with all three sides equal.
   等腰三角形是所有三条边都相等的形状。
2. 2.The equilateral triangle has a unique symmetry that makes it visually appealing.
   等腰三角形具有独特的对称性，使其视觉上吸引人。
3. 3. In mathematics, the equilateral triangle is used to represent a square in a coordinate plane.
   在数学中，等腰三角形用来表示坐标平面上的正方形。