UPSC 2016 CDS I Math Paper

Area of the rhombus EFGH = 2 square units
∴

1

2

×FH×EG=2
⇒ FH × EG = 4 square units....(1)
Now, AB = HF and EG = BC
Therefore, area of the rectangleABCD = AB × BC = 4 square units [using (1)]