Some friends don't understand the difference between the square meter and the extended meter used in the installation process of the iron guardrail, so they don't understand how to calculate the installation quantities of the iron guardrail.

　　通常情况下，铁艺护栏的安装工程量是按照平方米计算的，也可以按照图纸的尺寸按照投影面积进行计算得出。延长米是在计算重量的时候使用到的。计算面积不适用延长米。

　　In general, the installation quantity of iron guardrail is calculated in square meters, and it can also be calculated according to the size of the drawing and the projected area. The extension meter is used to calculate the weight. The calculation area does not apply to the extension meter.

　　一般情况下，济南铁艺护栏生产厂家是按照平方米进行报价的，所以安装工程量按照平方米计算是更简便快捷的方法。

　　In general, Jinan iron guardrail manufacturers quote according to square meters, so the calculation of installation quantities according to square meters is the most convenient and quick method.