Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
Num triângulo com a=16, b=31, c=20, encontre o ângulo B
Num triângulo com a=16, b=31, c=20, encontre o ângulo B
Natural Language
Math Input
Extended Keyboard