Perpendicular - Running Object Snap

Draw a line snap to the perpendicular of the curcle

If you extend the line, it will pass through the center of the circle

Draw a line snap perpendicular to an arc

If you extend the line, it also pass through the center of the arc

Draw a line, start a point from the perpendicular of another line

Snap to the endpoint of another object
The line maintain 90 degrees to the 1st line pick

You can draw:
Line perpendicular to circle
Line perpendicular to arc
Line perpendicular to line