Answer:
6π cm
Attached is the missing image
Explanation:
The circumference of a circle can be expressed as;
C = 2πr
The length of an arc with angle ∅ (in radian) can be expressed as;
Arc Length = radius × radian angle
L = r∅
Given; from the attached image
Radius r = 18 cm
Radian angle ∅ = π/3 radians
Substituting the values;
Arc length L = 18cm × π/3 = 18/3 π cm
Arc length L = 6π cm