The length and breadth of a metal sheet are 3.124 m and 3.002 m respectively, the area of this sheet up to four correct significant figure is

According to rule of significant figures.Hence, breadth of metal b = 3.002 m has four significant figures.∴Length of metal = 3.124 m has four significant figures.Since length and breadth have four significant,ThereforeArea  = length × breadth= 3.124 × 3.002 = 9.378248Will also have four significant figures.Hence, area = 9.378 m2Errors of measurement.