[填空题]
The surface area of a baseballg+)wisf r-n r2 vb2+ :iq8 ;kshcuzgm4is made up of two equal leather strips. The height of the baseball laying on the ground is 73 mm. Assuming the surface of the baseballhk4v+2suic mb:;qgz8 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
