[填空题]
The surface area of a bakd,ev-y)(zev 1 w)cy nsewavol9 p *ik;,ball is made up of two equal leather strips. The height of the baseball laying on the ground is 73 mm. Assumiwi;*koa , lpv9ng 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
