输入三角形的三个边就能计算出三角形的周长，面积，以及判断它的类型（钝角，锐角，直角），画面很炫，绝对原创-The input three sides of the triangle will be able to calculate the triangular perimeter, area, and to determine its type (an obtuse angle, acute angle, right angle), the picture is stunning, absolutely original