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Q.

The diagonals of a rectangle are equal. A traffic signal board, indicating 'SCHOOL AHEAD' , is an equilateral triangle with side 'a'. Find the area of the signal board, using Heron's formula. If its perimeter is 180cm, what will be the area of the signal board?


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a

1558.8 cm2

b

1700 cm2

c

1900 cm2

d

1200 cm2

answer is A.

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Detailed Solution

Question ImageQuestion ImageQuestion Image    p =  a + b + c
   180 = a +  a + a
   180= 3a
    a = 60
Question ImageHence, Option (1) is the correct answer.
  
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