2012 · Q79
The area of a rectangle whose one side is 'a' is 2a^2. What is the area of a square having one of the diagonals of the rectangle as side?
Elementary MathematicsMensuration
- A2a^2
- B3a^2
- C4a^2
- D5a^2
Explanation
The other side is 2a, diagonal = sqrt(a^2+4a^2) = a*sqrt(5), so the square has area 5a^2.