The general expression for the length of the arc of a circle is express as :
In the given figure we have to find the arc of red line :
Angle substended by Red arc = 360 - Angle substended by blue arc
Angle susbtended by Red arc = 360 - 30
Angle substended by Red arc = 330 degree
here, diameter = 36 inch
Radius = Diameter/2
Radius = 36/2
Radius = 18 inch
Substitute the value of radius = 18 inch, angle = 330
Answer: A) 33 pie inch