Home
Class 7
MATHS
The radius of a circular card board is 2...

The radius of a circular card board is 20 cm. A strip of width 4 cm is removed all along its border. The percenrage of the area of the strip removed is _______.

A

`50%`

B

`36%`

C

`40%`

D

`25%`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • MENSURATION

    PEARSON IIT JEE FOUNDATION|Exercise CONCEPT APPLICATION (LEVEL 3)|50 Videos

  • MENSURATION

    PEARSON IIT JEE FOUNDATION|Exercise ASSESSMENT TESTS|24 Videos

  • MENSURATION

    PEARSON IIT JEE FOUNDATION|Exercise ESSAY TYPE QUESTIONS|23 Videos

  • INDICES

    PEARSON IIT JEE FOUNDATION|Exercise Test -2|12 Videos

  • MOCK TEST

    PEARSON IIT JEE FOUNDATION|Exercise QUESTIONS|25 Videos

Similar Questions

Explore conceptually related problems

From a circular aluminium sheet of radius 14 cm, a sector of angle 45^(@) is removed. Find the percentage of the area of the sector removed.

From a square sheet of side 8 cm , a piece of a paper width 2 cm is removed along the border. Then find the area of the removed piece of paper.

Height of a right circular cylinder is 20 cm.If the radius is its base 14 cm, then what will be the curved surface area of the cylinder?

The radius of a right circular cone is 3 cm and its height is 4 cm. The total surface area of the cone is

The vertical height of a right circular cone is 9 cm and radius of its base is 4 cm. Find its volume.

The circumference of a circular field is 528 cm . Then its radius is

A sheet of paper measures 30cm by 20cm.A strip of 4cm wide is cut from it all around.Find the area of the remaining sheet and also the area of the cut-out strip.

From a circular disc of radius R , another disc of diameter R is removed. Locate c.m. of the remaining portion.

The radius of the base of cylinder is 20 cm and its height is 13 cm . Find its curved surface area .

PEARSON IIT JEE FOUNDATION-MENSURATION-CONCEPT APPLICATION (LEVEL 2)
  1. The angle of a sector of radius 14 cm is 90^(@). The area of the secto...

    Text Solution

    |

  2. The area of the shaded part in the figure given below is .

    Text Solution

    |

  3. The angle of a sector is 120^(@) and its radius is 21 cm. The area o...

    Text Solution

    |

  4. The length and breadth of a rectangular field are 4 m and 3 m, respect...

    Text Solution

    |

  5. A path of 3 metres wide runs around and outside a rectangualr playgrou...

    Text Solution

    |

  6. The length and breadth of a rectangular field are 10 m and 8 m, respec...

    Text Solution

    |

  7. The angle of a sector of a circle is 90^(@). The ratio of the area of ...

    Text Solution

    |

  8. The radius of a circle field is 105 m. The area obtained by a sector o...

    Text Solution

    |

  9. A farmer wants to purchase a land which is in the shape of trapezium....

    Text Solution

    |

  10. The radius of a circular card board is 20 cm. A strip of width 4 cm is...

    Text Solution

    |

  11. The side of a square metal sheet is 7 m. A circular sheet of maximum r...

    Text Solution

    |

  12. The side of a square metal sheet is 12 m. Four squares each of side 3 ...

    Text Solution

    |

  13. The dimensions of a class room are 15 ft xx10 ft xx 11 ft. The area of...

    Text Solution

    |

  14. The parallel sides of a trapezium ABCD are 16 cm and 8 cm and the dist...

    Text Solution

    |

  15. A circle of radius 7 cm rotates inside and around the circumference of...

    Text Solution

    |

  16. If a square is inscribed in a circle of radius 7 cm, then find the are...

    Text Solution

    |

  17. Find the cost of fencing a semi-circular garden of radius 7 m at Rs. 1...

    Text Solution

    |

  18. The edge of two cubes are 2 cm and 4 cm. Find the ratio of the volumes...

    Text Solution

    |

  19. Find the area of the shaded part in the figure given above.

    Text Solution

    |

  20. The angle of a sector of radius 14 cm is 90^(@). The area of the secto...

    Text Solution

    |