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If the sides of an equilateral triangle is decreased by 20%, its area is decreased by  

(a)

36%

(b)

40%

(c)

60%

(d)

64%



Question ID - 50131 | SaraNextGen Top Answer

If the sides of an equilateral triangle is decreased by 20%, its area is decreased by  

(a)

36%

(b)

40%

(c)

60%

(d)

64%

1 Answer
127 votes
Answer Key / Explanation : (a) -

Let the sides be  and 80% of  =

 

Initial area =

 

Final area = .

 

Decrease in area =

 

Decrease % =

127 votes


127