If geometry has always freaked you up, here is an app to help it out.
This a triangle calculator app, as the name suggests it help you in calculating various aspects of a triangle.
You just have to input the coordinates of all the three sides or at least two sides and this will do the rest.
It shows you a lot of calculations as per the triangle coordinates, like. angles, sin, cos, tan, length of sides, perimeter, and lots more.
You can also select the type of triangle you intend to create and start from that or lock in sides and do the changes.
Below are some screenshots of the app.
The app is available on playstore here.
Do check it out and have some fun.
Have a great day.