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, absol

计算梯形容器的展开面积，提供上下底直径和高度即可-Computing trapezoidal container developed area, providing the upper and lower end of the diameter and height can be

根据不锈钢管的才子、外径及壁厚计算其每米理论重量，理论外表面积，理论内表面积的小工具。主要供非专业土木建筑人士使用。(A small tool for calculating the theoretical weight per meter, theoretical surface area, and theoretical surface area according to the talent, diameter and wall thickness of the stainless ste