Respuesta :
normally, compasses are circles
you didn't give us a height so we only need to compute the area of the face of the compass
area of circle=pir²
2r=d so
area=12.56
12.56=pir³
aprox pi=3.141592
divide both sides by pi or 3.141592
3.99=r³
sqrt both sides
about 2
2=r
2r=d
2(2)=d
4=d
diameter is 4cm
you didn't give us a height so we only need to compute the area of the face of the compass
area of circle=pir²
2r=d so
area=12.56
12.56=pir³
aprox pi=3.141592
divide both sides by pi or 3.141592
3.99=r³
sqrt both sides
about 2
2=r
2r=d
2(2)=d
4=d
diameter is 4cm