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adjacent angles two angles that have a common vertex and one common side.
altitude in geometry, a perpendicular line segment that extends from one vertex of a figure to the opposite edge or face, or the length of such a line segment; height. [1/4 definitions]
apex the uppermost point; tip; summit; vertex. [1/2 definitions]
sine of an angle whose vertex is the center of a circle, and one of whose sides is on the x axis, the positive or negative ratio of the ordinate of the arc cut by the angle's other side to the radius of the circle. [1/2 definitions]
triangulation a system used by navigators and surveyors to calculate the distance between two points, or the relative position of points on a plane, in which each known point is made the vertex of a triangle and each triangle is given a base line of known length. [1/2 definitions]