Antilog Calculator vs TriangleData Usage & Stats

Do you need to check it if a corner has 90 degree? Just take a measuring from the corner to some point on the first side, then do the same on another side and then, take a measuring between these points and pull all 3 measuring in to this app, the app will calculate all angles for you. Or you can just calculate right triangle data. Feel free to use it as you want.