Use Point/On,C,Atangl with the circle reference and the angle in degrees from the positive X axis. No selector needed.
Full Answer
Use Point/On,C,Atangl. Specify the circle reference and the angle in degrees measured from the positive X axis, counterclockwise. The point is created on the circle circumference at the exact angular position.
Formula: x = cx + r*cos(angle), y = cy + r*sin(angle)
XyzPilot Example
C0 = Centre (0,0), radius 100
Point/On, C0, Atangl, 0, 0
→ P0 = (100, 0) [0 degrees — rightmost]
Point/On, C0, Atangl, 90, 0
→ P1 = (0, 100) [90 degrees — top]
Point/On, C0, Atangl, 180, 0
→ P2 = (-100, 0) [180 degrees — leftmost]
Point/On, C0, Atangl, 270, 0
→ P3 = (0, -100) [270 degrees — bottom]
Point/On, C0, Atangl, 45, 0
→ P4 = (70.711, 70.711) [45 degrees]