Angle C of Quadrilateral is the space between two intersecting lines (side b and side c) or surfaces at or close to the point where they meet. And is denoted by ∠C. Angle C of Quadrilateral is usually measured using the Degree for Angle. Note that the value of Angle C of Quadrilateral is always positive. Typically, the value of Angle C of Quadrilateral lies in the range from 0 to 180.