Area factor, scale factor

The area of an island on a map is 30 cm^2 .the scale used on the map is 1:100000
i)Calculate the area in square kilometres of the real island.
ii)An airport on the island on a rectangular piece of land measuring 3km and 2km. Calculate the area of the airport on the map in cm^2

scale is 1:100000,that is 1 cm =100000 cm or 1000 m = 1 km.
1 cm x 1 cm = 1 cm^2
1 cm^2 = 1 km^2
30 cm^2 = 30 km^2

3km x 2km = 6.0 km^2
3*100000 cm x 2*100000 cm
3 x 2 = 6 cm^2,using the same scale as above.

1 : 100,000

1 km = 1000 m = 100,000 cm

1cm = 1 km

1 cm^2 = 1 km^2

30 cm^2 = 30 km^2 ANSWER

ii) 6km ^2 = 6 cm^2 ANSWER

1) 3000000km^2
2)6cm^2