Given:
The plastic lid of a cylindrical container is a circle. 
 The lid has a diameter of 12 centimeters. 
so, d = 12 cm
We will find the circumference of the lid
We will calculate the circumference using the following formula:

Substitute d = 12 and π = 3.14
so, the circumference will be as follows:

Rounding to the nearest tenth
So, the answer will be circumference = 37.7 cm