Free online tool for calculating the common formulae for circles, triangles and more .
And there is also a calculator with many other keys and letters, and I love it. Also has step by step solutions and is completely free without ads. Mind blowing, this app really helps me with math problems nothing wrong with it it has adds but they don't bother and I definitely recommend using this app for mostly any math problem.
According to me it is the best mathematics app, I ever used. It helps me with my math problems but on thing I don't like is when calculating long division it requires me to use visa card and all that, instard of just using my phone data, it's a real life saver, this app is really good.