A copper wire is bent in the form of square with an area of 121 cm². If the same wire is bent in the shape of a circle the radius of the circle is ?
A11 cm
B7 cm
C9 cm
D5 cm
Answer:
B. 7 cm
Read Explanation:
Area of the square= a² = 121
a = 11
Total length of wire = 4a = 44 cm
Perimeter of circle = 44 cm
2πr = 44 cm
2 × 22/7 × r = 44
r = 44 × 7/(22 × 2)
= 7 cm
