The Outer Angle of Fourstar is the angle between adjacent isosceles triangle or the triangular spikes that attached to the square of the Fourstar. And is denoted by ∠Outer. Outer Angle of Fourstar is usually measured using the Degree for Angle. Note that the value of Outer Angle of Fourstar is always positive. Typically, the value of Outer Angle of Fourstar lies in the range from 90 to 180.