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Question

If the area of an equilateral triangle is 253 cm2, then its perimeter = ____ cm.


A

10

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B

30

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C

45

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D

60

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Solution

The correct option is B

30


Area of an equilateral triangle with side 'a' is given by 34 a2.
Given, area = 253 cm2

253=34 a2

a2=52×22

a=10 cm

Then, Perimeter =3a

= 3(10)

= 30 cm


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