To find the radius of the sink drain, we can use the formula for the diameter of a circle:
d = 2r
where d is the distance across the sink drain, and r is the radius.
Substituting the given value, we get:
3.8 cm = 2r
Dividing both sides by 2, we get:
r = 1.9 cm
So the radius of the sink drain is 1.9 cm.
To find the circumference of the sink drain, we can use the formula:
C = 2πr
where C is the circumference, and r is the radius we just found.
Substituting the value of r, we get:
C = 2π(1.9 cm)
C ≈ 11.94 cm
So the circumference of the sink drain is approximately 11.94 cm.