Answer:
[tex]51mm^2[/tex]
Step-by-step explanation:
What you have is a square and a rectangle
The formula to find the area of a square is
[tex]A=a^2=3^2=9mm^2[/tex] (you only need one side as they are all the same)
The formula for a rectangle is
[tex]A=wl=6*7=42mm^2[/tex]
Then you add them both up
[tex]9+42=51mm^2[/tex]
