A= π r2
<span>r= 39.4/2=19.7
A= 19.7 x 19.7=388.09
A= pi x 388.09= </span>1218.6026<span>
A= 1218.6026
</span>
A is the answer your welcome
Step-by-step explanation:

The answer is 12
Blue eyes and brown eyes combined is 18 and the number of students with green eyes is 6
so 18 - 6 = 12