right cone

例句：

1. 1.The right cone of the triangle is 30 degrees.
   三角形的右锥角是30度。
2. 2. The right cone of the cone is its apex.
   圆锥的右锥面是它的顶点。
3. 3.The right cone of the cylinder is its base.
   圆柱的右锥面是它的底面。