Question

a circular piece of thin wire Is converted into a square of side 6.25 cm. if there is no loss or gain in its length, find the radius of the circular wire

Answer 1

side of square= 6.25cm
perimeter of Square = 4 *side
= 6.25*4
=25.00cm
25cm
perimeter of square= circumference of circle
( because of the same wire used in both cases)
circumference of circle= 25cm
$2\pi \times r = 25 \\ 2 \times 22 \div 7 \times r = 25 \\ r = 25 \times 7 \div 2 \times 22 \\ r = 175 \div 4 4 \\ r = 3.97cm(approx)$
r= 175*44
r=3.97cm (approx)