Delhi Police Constable Exam Model Paper 4

GIVEN: Length of diagonal of a square is $15\sqrt{2}$ cm
FORMULA USED:
Area of square = ${\mathit{a}}^2$
Length of diagonal of a square = $\mathit{a}\sqrt{2}$
CALCULATION:
Length of diagonal of a square = $15\sqrt{2}$ cm
Length of side of square = $15\frac{\sqrt{2}}{\sqrt{2}}=15$ cm
Now, area of square $={\mathit{a}}^2={15}^2=225\mathit{c}{\mathit{m}}^2$