54 yards =
4937.76 centimeters
I don't know about the first one but for the second one:

Well to find the area of a circle Pie times r^2. But If you already have the diameter, you could either split the diameter in half, and do the regulaur formula, OR you could ude this formula ----> Pie times The diameter
Answer:
(-1,6)
Explanation:
use (y1-y2), (x1-x2)
91/100 is already in simplest form