[填空题]
The surface area of a baxa-f: f/i9q gtll88o mseball is made up of tw 4e l74onmp gb9zue2f4o equal leather strips. The height of the baseball laying on the ground is 73 mm. Assuming the surface of th4e fm upnlbgo9 74ze42e baseball is a sphere:
1.Find the area of one leather strip used to make the baseball in $mm^2$. Give your answer correct to one decimal place. $mm^2$
2.Find the circumference of the baseball. Give your answer in mm correct to three significant figures. mm
