In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
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Question: Problem: the length of a rectangle is reduced by 15 % . by what % would the width have to be increased to maintain the original area ? 
Options: ['a ) 10 %', 'b ) 20 %', 'c ) 17.6 %', 'd ) 30 %', 'e ) 35 %']

Answer: c


Question: Problem: the radius of a cone is 10 m , height 21 m . the volume of the cone is : 
Options: ['a ) 2200', 'b ) 1100', 'c ) 5500', 'd ) 3300', 'e ) 1050']

Answer: a


Question: Problem: f and e are midpoints of ab and ad respectively . if the side of square abcd is 8 , what is the area of triangle cef ? 
Options: ['a ) 8 √ 2', 'b ) 9 √ 3', 'c ) 18', 'd ) 16 √ 2', 'e ) 24']

Answer:
e


