Meaning of Canvas arc function

Question

I am working with canvas arc function.I am unable to figure out the meaning of last two parameters. Please help me with the meaning of parameters.Thank You

ctx.arc(x, y, 70,0, 2 * Math.PI);

Answer 1

That's the end angle, previous parameters say that the arc starts at 0 angle to 2PI.

2PI = 360° so you are drawing a circle.