text: trig help please? if (6sqrt13) is a point on the terminal ray of angle 0 in the standard position, then tan 0 =   an angle with measure equal to 3pi/4 is? it is irrelevant that the terminal ray is pointing whatever number.  tan(0) is just always 0.  question: rewrite x in radian as quantity in degree. answer: we use the ratio pi(radian):180(degree). if we let d be the quantity in degree for x in radian, we can find d from the following ratio equation.  x(radian) : d(degree) = pi(radian) : 180(degree) => (pi)d = 180(x) => d = 180(x)/pi  in your question, x = 3pi/4.  hence, d = 180(3pi/4)/pi = 135 (degree).