Answer:
Step-by-step explanation:
√20 is the correct answer. It's between 4 and 5, just as 20 is between 4^2 and 5^2 (or 16 and 25).
i dont know sorry
C=31.41592654
C=2πr
r=5
C=2π(5)
Therefore C= 10π or C=31.41592654
