Home
Class 9
MATHS
The surface area of a sphere of radius 2...

The surface area of a sphere of radius `21 cm` is

A

`2772 cm^(2)`

B

`1386 cm^(2)`

C

`4158 cm^(2)`

D

`5544 cm^(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • VOLUME AND SURFACE AREA OF SOLIDS

    RS AGGARWAL|Exercise Exercise 15D|28 Videos

  • TRIANGLES

    RS AGGARWAL|Exercise MULTIPLE-CHOICE QUESTIONS (MCQ)|10 Videos

Similar Questions

Explore conceptually related problems

The approximate surface area of a sphere of radius 4.01 cm is

The approximate surface area of a sphere of radius 6.01 cm is

Find the surface area of a sphere of radius: 10.5 cm (ii) 5.6 cm (iii) 14 cm

The surface area of a sphere of radius 5cm is five xx the curved surface area of a cone of radius 4cm. Find the height and volume (correct to two decimal places) of the cone.

Find the surface area of a sphere of radius 14cm.

Find the surface area of a sphere of radius 7 cm.

Find the surface area of a sphere of radius 1.4 cm. (pi-(22)/(7))

Find the volume and surface area of a sphere of radius 21 cm.

Find the surface area of a sphere of radius 3.5 cm.

RS AGGARWAL-VOLUME AND SURFACE AREA OF SOLIDS-Multiple Choice Questions (Mcq)
  1. The volume of a sphere of radius 2r is

    Text Solution

    |

  2. The volume of a sphere of radius 10.5 cm is

    Text Solution

    |

  3. The surface area of a sphere of radius 21 cm is

    Text Solution

    |

  4. The surface area of a sphere is 1386 cm^(2). Its volume is

    Text Solution

    |

  5. If the surface area of a sphere is (144 pi)m^(2) then its volume is

    Text Solution

    |

  6. The volume of a sphere is 38808 cm^(3). Its curved surface area is

    Text Solution

    |

  7. If the ratio of the volumes of two spheres is 1 : 8 then the ratio of ...

    Text Solution

    |

  8. A solid metal ball of radius 8 cm is melted and cast into smaller ball...

    Text Solution

    |

  9. A cone is 8.4 cm heigh and the radius of its base is 2.1 cm. It is mel...

    Text Solution

    |

  10. A solid lead ball of radius 6 cm is melted and then drawn into a wire ...

    Text Solution

    |

  11. A metallic sphere of radius 10.5 cm is melted and then react into smal...

    Text Solution

    |

  12. How many lead shots, each 0.3 cm in diameter, can be made from a cuboi...

    Text Solution

    |

  13. The diameter of a sphere is 6 cm. It is melted and drawn into a wire o...

    Text Solution

    |

  14. A sphere of diameter 12.6 cm is melted and cast into a right circular ...

    Text Solution

    |

  15. A spherical ball of radius 3 cm is melted and recast into three spheri...

    Text Solution

    |

  16. The radius of hemispherical balloon increases from 6 cm to 12 cm as ai...

    Text Solution

    |

  17. The volumes of two spheres are in the ratio 64 : 27 and the sum of the...

    Text Solution

    |

  18. A hemispherical bowl of radius 9 cm contains a liquid. This liquid is ...

    Text Solution

    |

  19. A cone and a hemisphere have equal bases and equal volumes. The ratio ...

    Text Solution

    |

  20. A cone, a hemisphere and a cylinder stand on equal bases and have th...

    Text Solution

    |