Question

The area of a circular ring formed by two concentric circles whose radii are 5.7 cm and 4.3 cm respectively is (Take π = 3 1416 . )

Answer 1

Step-by-step explanation:

Let the radii of the outer and inner circles be

r1 and r2

area = πr²1-πr²2=π(5.7²-4.3²)=(22/7)(5.7+4.3)(5.7-4.3)=22/7 ×10×1.4=44 cm².