ocr: Latitude is measured as an angle from the equator of the Earth (0°)1 to the North Pole (90° North) or South Pole (90° South). Think of the center of the Earth as the latitude's vertex and the plane made by the equator as the adjacent side or base of the angle. Latitude lines are made by circles that run parallel to the equator's plane, and grow progressively smaller as they get closer to the poles. Latitudes Vertex Adjacent Side or Base of Angle