Q:

What's the difference between pow and sqrt in this code?

I'm not the best at Arduino so I'm sorry for my "noobiness".
I'm extending some code that I found online to work on the gyroscope that I'm building.
I'm wondering what the difference is between pow and sqrt in this code.
I'm also wondering what the 180/pi is used for. I haven't gotten my mind around this part yet.
arx = (180/3.141592) * atan(ax / pow((ay, 2) + pow(az, 2)); 

What's the difference here?
ary = (180/3.141592) * atan(ay / sqrt(square(ax, 2) + square(az, 2)));

A:

Converting Gerben's comment into an answer:

pow(x, 2) is the second power, in other words:

sqrt(x) is the square root of x, that is:

A whole circle is 360 degrees or 2π when measuring in radians. So this ratio of 180 / 3.141592 is used to convert an angle in radians to an angle in degrees.

