Respuesta :

jazzy8340
5x6= 30
3x3=9 
30-9= 21 square meter. 
Hello there, fellow human being!

So, I am going to divide the cement area into two different parts.
First part: 5 * 3 = 15 m
Second part: 2 * 3 = 6 m
15 + 6 = 21 m

So, the cement area is 21 m.

Hope this helped!
~Ruru