[填空题]
The surface area of a(i qj ,tj2k:snvak 8r1yrp1 1s baseball is made up of two e+k0e iaknt8wlw(+d)mqual leather strips. The height of the baseball laying on the ground is 73 mm. Assuming the surface of the ba8k t)e+amw+dlnk0 ( iwseball 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
