单击右键，选择所画图形种类，再用鼠标按住左键拖动。画出你想要的图形，还可以选择计算里面的面积。计算出你画图形的面积-Right-click and select the type of graphic art, and then hold down the left mouse drag. You want to draw the graphics, which also have the option to calculate the area. To calculate the size o