Answer:
6 u²
Step-by-step explanation:
Since A=a² and A=3²⇒A=9 u² Then to draw a rectangle is to draw a rectangle whose area is < 9 u², the restriction made by the question. Since the rectangle area= b*h and one side is equal to 3, then the Rectangle area is 3*2=6 cm², and 3*2 is lesser than 9.
b*h < 9 ⇒3*2<9
(The Rectangle below in green)