Question

Area of a side of a Rubik's cube is 441 sq ft. Find the length of each of its side.

• A. 21 ft
• B. 20 ft
• C. 19 ft
• D. 24 ft

Answer 1

The correct option is A 21 ft

Length of square = $\sqrt{\text{Area of square}}$

Given, area is 441 sq ft.

Now, 441 can be simplied as:
$441=3\times 147=3\times 3\times 49=3\times 3\times 7\times 7=3\times 7\times 3\times 7=21\times 21$

So, length of each side of the Rubik's cube is:
$\sqrt{441}=\sqrt{21\times 21}$
$=21$