8th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer Find the surface area of a sphere of radius 6.3 cm.

    A)  600 \[c{{m}^{2}}\]                

    B)  700 \[c{{m}^{2}}\]         

    C)  550 \[c{{m}^{2}}\]                            

    D)  498.96 \[c{{m}^{2}}\]

    Correct Answer: D

    Solution :

    (d): surface area \[4\pi {{r}^{2}}\] \[4\times \frac{22}{7}\times \left( 6.3 \right)\times \left( 6.3 \right)\] \[=88\times 0.9\times 6.3\] \[=88\times 5.67\] = 498.98.

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