Question 26617
1 ACRE =4840 SQUARE YARDS.
1 YARD = 3 FEET =3 *12 INCHES=36 INCHES
1 INCH = 2.54 CM =2.54/100 METRES=0.0254 M. 
HENCE 1 YARD = 36*0.0254 M = 0.9144 M.=0.9144/1000 KM.=0.0009144 KM
1 SQUARTE YARD = 1 YARD * 1 YARD =0.0009144 KM * 0.0009144 KM
1 ACRE =4840 SQ.YDS.=4840*0.0009144*0.0009144 SQUARE KM.
=0.004047 SQUARE KILOMETRES.