Calculate angular distance and distance between two places on Earth on the same parallel of latitude.  𝐷 = 111.2 cos 𝜃 × angular distance where 𝐷 is distance in kilometres and 𝜃 is latitude

Four coastal weather stations are located along the same parallel of latitude in Western Australia. Their positions are given in the table below. (a) Calculate the angular distance between Station A and Station D. (1 mark) (b) Calculate the distance between Station A and Station D along the parallel of latitude, to the nearest kilometre. (3 marks)