Can someone help me pls?

Okay so basically the 12 yd is your diameter for the circle,
Since you want the whole perimeter of the circle, which is the shaded area, you will find the circumference (perimeter) of the circle.
Using the equation of:
pi x diameter
and you will find your answer
in this case your answer is 37.699

Think of it as five or above give it a shove. change the 5 or above to the right to a zero and add one to the number on the left.