WAEC Geography 2014 Papers

Concept:Any two meridians exactly opposite each other are separated by $180^\circ$ of longitude and together form a Great Circle.Explanation:The meridian that lies opposite a given longitude is found by adding or subtracting $180^\circ$ from it.Here, the given longitude is $180^\circ$.So the opposite longitude is $180^\circ - 180^\circ = 0^\circ$.The $0^\circ$ meridian lies exactly halfway around the globe from the $180^\circ$ meridian.Together, these two meridians divide the Earth into two equal semicircles.Thus, they form a complete Great Circle.Hence, Longitude $0^\circ$ joins Longitude $180^\circ$ on the opposite side of the globe.Answer:A. Longitude $0^\circ$