It seems that there is no problem, but what is wrong?
When ordering a security net, it is better to negotiate with the store to calculate the amount of money. After the installation, because it is outwardly extended, there are a total of 5 faces. The master directly takes the ruler along the left, front and right lengths, and then measures the height along the front and the top of the left. It is said that this anti-theft net spread out is a rectangle, so that the length and width of the space is just the area, which is convenient and fast, without the trouble of one side! We actually believed it... Later, I was told by people that he had counted the money in several corners. It was a pit! Bullying, I didn't learn stereo geometry?