x and y are points on the earth's surface at opposite ends of a diameter through the centre of the Earth.

Question

(a) If the longitude of x is 19 degrees East, what is the longitude of y?
(b) If the latitude of x is 52 degrees North, what is the latitude of y?

Answer 1

(a) opposite ends of a diameter are 180° apart in longitude
(b) opposite ends of a diameter have equal latitude, one N and the other S

Answer 2

161