How does a carpenter use algebra?

Algebra can be used to determine what dimensions to use to make a box with a given volume and use the least material possible. A carpenter uses algebra in order to calculate the area of a space in order to buy supplies, calculate estimates for jobs, measure and cut supplies need to correctly to a job. A carpenter will also use algebra to build and estimate space needed for installation of appliances and objects. Also He uses it to find the angle at which two walls are put together, how long he must cut how many pieces of wood. How much cement he needs to go with the 30 yards of sand and gravel that was just delivered for a slab of a given size.