Hi,

The sum of the base and height of a rectangle is 69 cm. 

Find the dimensions for which the area is maximum (When it is a Square)

 b + h = 69cm

 b = h = 69cm/2 = 34.5cm

the dimensions  34.5cm  by 34.5cm

Note:

 A= b(69-b)

A =  -b^2 + 69  |Completing Square to find Maximum Point



      b = 69/2 when A is maxed and h = 69/2  (rectangle a square) 

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