A room is in the shape of cube and the length of the longest rod placed in it is $21\sqrt{3}$cm. The area of the floor is: |
441 cm2 144 cm2 169 cm2 961 cm2 |
441 cm2 |
We know that, Diagonal of cube = Side\(\sqrt {3}\) Area of floor = Side2 We have, Length of the longest rod = 21\(\sqrt {3}\) m. Length of the longest rod of cube = Diagonal of cube = \(\sqrt {3}\) × Side of cube 21\(\sqrt {3}\) = Side\(\sqrt {3}\) Side = 21 m Area of floor = = 212 = 441 m2. |