Mass per Meter Run in Kg
1.2 cm in 12mm
You have specified three dimensions. A rectangular area will have a length and a width. If your length is 90m, is the width 25mm or 12mm? I can't make sense of this as it is.
I think you can make 12 pieces at most
18 pieces
1.2 cm
Impossible
12mm = 1.2cm
You need to make sure that the sentence you make fits the word pieces. For example: I have 24 pieces of cake. How many pieces do I need to collect? The word pieces is most often used in numbers and more than 2.
50 square mm because 12mm 12 meter 1mm 1m 100mm= 1m
5
1 gigameter (Gm) is 1e+12mm