12 millimeters
9 millimeters
What’s the area of the rectangle?

Step-by-step explanation:
HERE,
lenth=12m.m.
breadth=9m.m.
so,
Area of rectangular =[tex]\boxed{\underline{\underbrace{\mathcal\color{gold}{length×breadth }}}}[/tex]
so
Area=9×12=[tex]\tt{ 108m.m^2 }[/tex] ⠀