[填空题]
The surface area of a bt,t;kq /y 1;25l9wktlwa3dn j/zs bixaseball xzvjz6(4k+4 kev)j9 5fecg kois made up of two equal leather strips. The height of the basebvce fk(4j9 zj6v+gx ko 4k5ze)all laying on the ground is 73 mm. Assuming the surface 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
