Question 769642
Taking the ratio 3:2
3x * 2x = 864
6x^2 = 864
x^2 = 144
x ={{{sqrt(144)}}}
x = 12
So, Length = 3* 12 = 36cm
Breadth = 2 * 12 = 24cm
36 * 24 = 864cm^2
Hope this helps.
:-)