????????????? sircomeferens measures ????????????
serkel rim leng=10=pi*diameter
impli diameter=10/pi=10/3.14159265
diam=3.183098865
so radius=diam/2=1.591549433
so radius^2=2.533029597
serkel area=pi*radius*radius=3.1415926*2.533029597=
AREA=7.957747164