Total circumference = Total 36 segments of both a and 3 = 18a+18*3=18(a+3)

From Statement 1A central angle is aka angle of the arc = 12°

Formula for Angle of arc = (length/circumference) * 360°

Circumference= (length/angle of arc)*360°

circumference = (3/12)*360 = 90

Circumference = 18(a+3)=90

a+3 =5 => a=2

sufficient A

From statement 2part a/2 - > The portion of the circumference = length of the arc "a"

Part b/2 - > The portion of total degrees in the circle that the central angle that defines "a" occupies = angle of the arc

length of the arc "a"= angle of the arc = both unknown... so not sufficient

can somebody tell me if my reasoning is right.... thanks in advance