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