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A room is in the shape of a cube and the length of the longest rod placed in it is `21 sqrt 3` cm. The area of the floor is:
कोई कमरा घन के आकार में है तथा इसमें रखी गयी सबसे लंबी छड़ की लंबाई `21 sqrt 3` सेमी है | तल का क्षेत्रफल है :

A

`441 cm^2`

B

`144 cm^2`

C

`169 cm^2`

D

`961 cm^2`

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PINNACLE-MENSURATION-EXERCISE
  1. A cuboid of size 100 cm x 80 cm x 60 cm cut into eight identical parts...

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  2. If in a triangle angles are in the ratio 1:1:2 and the length of its l...

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  3. A room is in the shape of a cube and the length of the longest rod pla...

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  4. If the height of a circular cone is decreased by 10% and its radius is...

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  5. The hypotenuse of a right-angled triangle is 39 cm and the difference ...

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  6. There is a path of equal width of 3.5 m along with a building measurin...

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  7. If the length of a side of a square is equal to the diameter of a circ...

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  8. The radius and height of a cone are 20 cm and 21 cm respectively. The ...

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  9. The volume of a prism is 288 cm^3 and height is 24 cm. The base area (...

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  10. The length, breadth and height of a cuboid are 18 cm, 24 cm, and 4 cm ...

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  11. The area of the sheet metal needed to make a box of size 7cm x 8cm x 9...

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  12. The volume of prism is 308 cm^3 and height is 11 cm. The base area of ...

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  13. The diagonal of a square measures 6 sqrt2 cm. The measure of the diago...

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  14. How many cubes with a side 10 cm can be cut out of a cube having a sid...

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  15. Find the curved surface area of a right circular cylinder whose height...

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  16. If two cubes, each having the side 10 mm, are put in a box containing ...

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  17. A solid cube, in which the diagonal of each face is 128 sqrt2 cm, has ...

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  18. The total surface area of a hemisphere is 462 cm^2. What is the diamet...

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  19. A hemisphere of radius 30 cm is moulded to form a cylinder of height 1...

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  20. What is the total surface area of a cone which has a radius of 21 cm a...

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