+118608 150kmx18x0.15nm
assuming km is kilometres and nm is nanometres - this will be an area
1nm=10-12 km
150*18*0.15*10-12
=405*10-12
=4.05*10-10 km2
now there are 1000m in a km so 1000000=106m2 in 1 km2
=4.05*10-4 m2
no there are 100cm in a metre so there are 10000=104 cm2 in 1m2
=4.05 cm2
Of course it would have been easier to do the conversions into cm right at the beginning.
you could do that and check that I didn't make any silly mistakes. 
+118608 150kmx18x0.15nm
assuming km is kilometres and nm is nanometres - this will be an area
1nm=10-12 km
150*18*0.15*10-12
=405*10-12
=4.05*10-10 km2
now there are 1000m in a km so 1000000=106m2 in 1 km2
=4.05*10-4 m2
no there are 100cm in a metre so there are 10000=104 cm2 in 1m2
=4.05 cm2
Of course it would have been easier to do the conversions into cm right at the beginning.
you could do that and check that I didn't make any silly mistakes.
