The circular measure of an angle of an isosceles triangle is $$\frac{{5\pi }}{9}$$, circular measure of one of the other angles must be:
A. $$\frac{{5\pi }}{{18}}$$
B. $$\frac{{5\pi }}{9}$$
C. $$\frac{{2\pi }}{9}$$
D. $$\frac{{4\pi }}{9}$$
Answer: Option C
This Question Belongs to Arithmetic Ability >> Circular Measurement Of Angle
5π/9=100*
other two angles=80/2=40* each
40*=40×π/180=2π/9