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7th Class Mathematics Perimeter and Area Question Bank Perimeter and Area

  • question_answer
    How many plants (approximately) will be there in a circular bed whose outer edge measures \[30\text{ }cm\] allowing \[4\text{ }c{{m}^{2}}\]for each plant?

    A)  18                           

    B)         750

    C)  24                         

    D)         120

    Correct Answer: A

    Solution :

     Circumference = 30 cm Area \[=\frac{{{C}^{2}}}{4\pi }=\frac{30\times 30}{4\times \frac{22}{7}}=71.6\,c{{m}^{2}}\] Number of plants \[=\frac{A}{4}=\frac{71.6}{4}\]                                 \[=17.9\cong 18\]


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