Question

find the area of rectangle whose side are 2a and 3a

Answer 1

area = l×b therefore area of rectangle= 2a×3a =
$6a {}^{2}$

Answer 2

According to question 
sides of rectangle 
2a , 2a , 3a , 3a
we know that,
 Area of rectangle= length X breath _______equation (1)
so, 
   let length = 3a
        breath = 2a
but the value of length and breath in equation (1)
therefore, 
    Area of rectangle = 3a X 2a 
                                = 6$a^{2}$  <== answer