Answer:
100
Step-by-step explanation:
This is formula fot completing the square:
(b/2)^(2)
(-20/2)^(2)
100
For A put 160 (division sign} 4.
For B put -40
Answer:
The answer to the question provided is 11.
Step-by-step explanation:

[I apologize if the answer to the question provided is inaccurate]
The formula for the circumference is 2πr.
The diameter d is given, which is 2 times the radius r (d = 2r)
So you have to calculate π d = 3.142×1.8 ≈ 5.7