Step-by-step explanation:

Given :

Area of rectangle : 6a²+36a

Breadth : 36a

To Find :

Length

Solution :

We know that,

Area of rectangle = length × breadth

or , length = Area of rectangle/breadth

=> 6a²+36a/36a

=>6a(a + 6)/36

=> (a+6)/6

The required length is (a+6)/6.

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Area of rectangle =

                               =

                               =

Breadth =

Length =?

Area = Lenght × Breadth

Length =

Length =

∴ The length is equal to .