A square plot has perimeter $84$ m. Its area is

A square plot has perimeter $84$ m. Its area is
  1. $441$ m$^{2}$
  2. $84$ m$^{2}$
  3. $168$ m$^{2}$
  4. $196$ m$^{2}$

Solution

Side $= 84 / 4 = 21$ m. Area $= 21^{2} = 441$ m$^{2}$.

Asked in: IMO

Practice more SQUARES AND SQUARE ROOTS questions on Aicharya