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Last Updated On 23-10-2022 - By Sara

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 :-

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
5876 Votes
3537

Answer Key : (a) -

Let the sides be  and 80% of  =

 

Initial area =

 

Final area = .

 

Decrease in area =

 

Decrease % =



Next Question :

A rod of length 50cm is pivoted at one end, It is raised such that if makes an angle of 30°  from the horizontal as shown and released from rest.  Its angular speed when it passes through the horizontal (in rad s−1 )  will be (g=10ms−2)

a.

 

b.

 

c.

 

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