• # question_answer The area of a square is four times the area of a rectangle. The length of the rectangle is 25 cm and its breadth is one cm less than one-fifth of its length. What is the perimeter of the square? A)  40 cm             B)  60 cm C)  160 cm           D)       None of these

Breadth of rectangle                    $=25\frac{1}{5}\,\,\,\,1=4$ cm $\therefore$ Area of rectangle = length breadth $=25\,\,\,\,4=100$ sq.cm. $\therefore$ Area of square $=4\,\,\,100\,=400$ sq.cm. $\therefore$ Side of square $=\sqrt{400}\,\,=20$ cm. $\therefore$ Perimeter of square = 4 side  $=4\,\,\,\,20=80$ cm.