Q. A scale of 1cm to 2km is used for a map.
1. If the actual area of a lake is 18.000.000 square meter, calculate its area on the map.
in my opinion, the answer should be 4.500 square cm but why does it come to 4.5 square cm?
+9479 4.5 square cm is the same thing as 4.500 square cm,
just like 7 is the same thing as 07 is the same thing as 000007. 
+9479 Ok I don't know if you will see this, but I just realized that the answer I gave you was probably wrong because I forgot that some places use " . " as a seperator for thousands, not a decimal. In the rest of this post, I will just put spaces to separate thousands to avoid confusion.
actual area of the lake = 18 000 000 square meters
actual area of the lake = 18 000 000 / 10002 square kilometers
actual area of the lake = 18 000 000 / 1 000 000 square kilometers
actual area of the lake = 18 square kilometers
map area of the lake = 18 / 22 square cm
map area of the lake = 18 / 4 square cm
map area of the lake = 4.5 square cm <---(That " . " is a decimal)
