tentukan koordinat kutub nya jika koordinat kartesius titik b (5,5)

r = V(x^2 + y^2)
r = V(5^2 + 5^2)
r = V(25 + 25)
r = V50
r = 5V2
tan A = y/x
tan A = 5/5
tan A = 1
tan A = tan 45
A = 45
koordinat kutub = ( 5V2, 45° )