If the terminal arm of angleθin standard position passes through the ordered pair (4,5), then...

a) cos θ =My answer key tells me that√(41)/4

b) sin θ =5√(41)/41

c) tan θ = 0.555...

d) jakθ =1/2

b)is the answer but I have no clue how to find it. I have been trying for almost an hour now. Could anyone please leave a detailed response, possibly a picture and graph to show how it would look.