Gumball, you didn’t make it clear what grade you are in or which math you are learning but I will bite. Yes you do need to know math in life but I will agree that you don’t really need to know trigonometry unless you become an engineer, architect or scientist. In other areas of your life other formulas in math will be helpful. Fractions of course, decimals, and even angles and equations will have a place somewhere and at some time in your life. Whether it is figuring out space in your home, medications for yourself or your children, the blueprints and furniture layouts, if your contractor is following your plans, how long it will take you to get somewhere, if you have enough gas in the car, planning a budget and your finances, just getting enough change at the store, any number of projects at work, etc. Math comes into play in various areas of every day life and in various jobs and careers. Higher degrees of math comes into play in different careers as I said such as engineering and the sciences but basic math is used in every day life.
If you are a decorator you have to figure out how much yardage of fabric or carpeting for instance you need to cover the upholstery, the floors, or the windows according to the design you are creating. That of course depends on the width of the fabric (which comes in various sizes) the repeat of the pattern, which of course varies as well and the height, width and depth of the items you are covering. You see you need math in decorating. Same goes for wallpaper, size of the furniture etc.
If you are in commercial design, how many tables and chairs can you fit into this restaurant? How many customers can you feed at one time? All this is math.
Choose another career or industry and I will show you how math plays a part in it. For instance if you are a sales person, how much commission you make, how much you can afford to discount how much to charge for delivery, how much tax to include, etc. Everything is math.
Say you bought a car. How much is the depreciation, how much is it worth if you want to sell it in a year? How much do you owe the bank? How do you know if they are cheating you? You have to be on top of it and know how to figure it out on your own. You can’t trust anyone but yourself.