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

Problem: a rectangular window is twice as long as it is wide . if its perimeter is 18 feet , then what are its dimensions in feet ? 
Options: ['a ) 3 / 2 by 7 / 2', 'b ) 5 / 3 by 10 / 3', 'c ) 2 by 4', 'd ) 3 by 6', 'e ) 10 / 3 by 20 / 3']
d

Problem: find the surface area of a 8 cm x 4 cm x 2 cm brick . 
Options: a ) 136 cu cm , b ) 112 cu cm , c ) 164 cu cm , d ) 180 cu cm , e ) none
b

Problem: the diagonals of a rhombus are 12 cm and 15 cm . find its area ? 
Options: a ) 30 , b ) 45 , c ) 90 , d ) 120 , e ) 180

c