Answer:
the top one
because identity of addition is adding 0
idk
Step-by-step explanation:
we are nt on that yet
Given - Radius of ring is 9 millimeters
To find - Circumference
Solution -
9 millimeters = 0.9 centimeters
Circumference of circle = 2 × pie × r
= 2 × 3.14 × 0.9
= 6.28 × 0.9
= 5.652