[填空题]
The surface area of a baseball is made up of two equbvz8wm3 nli(2a,tp ql( :jfvbibph, +m,z(s -al leather strips. The height of the baseball laying on the ground is 73 mm. Assuming the surfab,:zvf,b p+iaq jpml(t(-s, hce of the 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
