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The diameter of the base of a right circ...

The diameter of the base of a right circular cone is 6 cm and height is 4 cm . Then the curved surface area of the cone is

A

`15pi` sq-cm

B

`30 pi` sq-cm

C

`40 ` sq-cm

D

`55` sq-cm

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • If the area of the base of a right circular cone be 4pi r^2 sq-cm and height be 3 cm , then the volume of the cone will be

    A
    `12 pi r^2c c`
    B
    `(4)/(3)pir^2h c c`
    C
    `(4)/(9)pi r^2h c c`
    D
    `4 pi r^2c c`

  • If the circumference of the base of a right circular cone be (264)/(7)cm and its slant height be 10 cm , then the volume of the cone will be

    A
    `288 pi c c`
    B
    `276 pi c c`
    C
    `292 pi c c`
    D
    `302 pi c c`

  • If the height of a right circular cone be 4.8 cm and its diameter of base 4 cm, then the slant height of the cone will be

    A
    `4.2cm`
    B
    `5.2cm`
    C
    `6.2cm`
    D
    `7.2cm`

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    The difference of the square of the height and the square of the base of a right circular cone of slant height 10 cm is 28cm, then the volume of the cone will be

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    The height of a right circular cone is 12 cm and its volume is 100Pi cm^3 . Find the lateral height of the cone.

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