In astronomy, geography, and related sciences and contexts, a direction or plane passing by a given point is said to be vertical if it contains the local gravity direction at that point. Conversely, a direction or plane is said to be horizontal if it is perpendicular to the vertical direction
it is called the <u>sector</u> of the circle. a sector is a part of a circle enclosed by two radii of the circle, like a slice of pie. hope this helps!
