The Inner Angle of Fourstar is the unequal angle of the isosceles triangle that attached to the square or the angle between the edges which form the triangular spike, of the Fourstar. And is denoted by ∠Inner. Inner Angle of Fourstar is usually measured using the Degree for Angle. Note that the value of Inner Angle of Fourstar is always positive. Typically, the value of Inner Angle of Fourstar lies in the range from 0 to 90.