a=pir^2
1.first one is 3.14 times 3.5*3.5=38.46 or about 38.5
2nd option
2.
c=2pir
c=2*3.5*3.14=21.98=22.0
4th opttion
3.
d/2=r
12/2=6
a=pir^2
a=3.14*6^2=113.04, or about 113.0
1st opiton
4.
8*5+1/2*3.14*4^2=65.12=65.1, so
3rd option
5.
2*2=4
4^2-3.14*2^2=3.44 or abot 3.4
3rd option