In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[Q]: Problem: one side of a rectangle is 3 cm shorter than the other side . if we increase the length of each side by 1 cm , then the area of the rectangle will increase by 16 cm 2 . find the lengths of all sides . 
Options: a ) 10 and 3 , b ) 9 and 6 , c ) 10 and 7 , d ) 3 and 10 , e ) 10 and 10
[A]: b


[Q]: Problem: the diameter of a circle is 4 / π . find the circumference of the circle . 
Options: ['a ) 8', 'b ) 4 π', 'c ) 4', 'd ) 6', 'e ) 5']
[A]: a


[Q]: Problem: the roof of an apartment building is rectangular and its length is 5 times longer than its width . if the area of the roof is 720 feet squared , what is the difference between the length and the width of the roof ? 
Options: a ) 38 . , b ) 40 . , c ) 42 . , d ) 44 . , e ) 48 .
[A]:
e