Answer:
1. pi*3^2=9pi <------ you can replace pi with 3.14 or 22/7 by multiplying
2. pi*d/2 ^2= pi*16=16pi
3. The square root of 78.5/pi should be the radius
4. 100pi
5. square root of 3.14/pi
6. 16pi
7. 36pi
8. 81pi
Step-by-step explanation:
