title: Draw the angle marks of a triangle in canvas
body: <p>I've been striving for while trying to draw the angle marks of a triangle in canvas and got nothing so far. I've tried using the arc method without success. Maybe I lack the math knowledge necessary to do this so I just ask please give me a function that takes 3 points ({x,y} type of objects) and draws a figure simillar to this one:</p>
  
  <p><a href="https://i.stack.imgur.com/lYokQ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lYokQ.jpg" alt="enter image description here"></a></p>
  
  <p>thanks!</p>