9th Class Mathematics Related to Competitive Exam Question Bank Mensuration

  • question_answer
    If the side of an equilateral triangle is 7 metres; its area (in sq. m.) is:

    A) 19. 2      

    B)                    21.22

    C) 20. 4                

    D) 25

    E) None of these

    Correct Answer: B

    Solution :

    Explanation Option [b] is correct. Area \[\operatorname{s}=\frac{\sqrt{3}}{4}\times {{7}^{2}}=21.22\,sq.\,m.\]


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