A wire is bent to form a square enclosing an area of 484 m2. Using the same wire, a circle is formed. Find the area of the circle.
Given:
Perimeter of square = Circumference of circle ………………. (i)
Area of Square = 484m2
Let the side of square be ‘x’ cm.
∵ Area of Square = side × side
∴ 484 = x × x
x2 = 484
x = √484 = 22cm
∵ Perimeter of square = 4 × side
= 4 × 22 = 88 cm
∴ Using (i), we have
Circumference of circle = 88 cm
Also, Circumference of Circle = 2πr
2πr = 88
2 × × r = 88
r = 88 × ×
r = 2 × 7 = 14 cm
Area of Circle = πr2 = × 14 × 14
= 22 × 2 × 14 = 616 cm2
Hence, the area of Circle is 616 cm2.