By definition, the area of a circle is given by:

Where,
r: radius of the circle.
Substituting the values in the given expression, we have:

Rounding to the nearest tenth we have:
Answer:
Approximately needed:
1 2 4 8 and 16 are the factors
Answer:
12
Step-by-step explanation:

Answer:
5b+3<10
Step-by-step explanation:
I hope I got it right