SQUARE in all cases (a) Perimeter of EQ. \[\DELTA =9\times 3=27\,cm\] Perimeter of square \[=12\times 4\,=48\,cm\] (b) Perimeter of eq. \[\Delta =12\times 3=36\,cm\] Perimeter of square = 9 x 4 = 36 cm (c) Perimeter of eq. \[\Delta =15\times 3=45\,cm\] Perimeter of square = 10 x 4 = 40 cm (d) Perimeter of eq. \[\Delta =6\times 3=18\,cm\] Perimeter of square = 4 x 4 = 16 cm THUS we see that perimeter of eq. A and square are equal in (2)