How many 1 mm squared is 1 kilometere squared?

Answer 1

1 kilometer = 1,000 meters

1 meter = 1,000 mm

So 1 kilometer = 1,000,000 mm

Now, just square both sides of that statement:

(1 kilometer)2 = (1,000,000 mm)2

1 km2 = 1 trillion mm2