Find the area of a circular ring whose inner and outer diameters are 2

1.	Find the area of a circular ring whose inner and outer diameters are 20 cm and 22 cm, Tespectively
Answer» diameter of inner circle=20cm therefore radius=20/2=10cm diameter of outer circle=22cm therefore radius=22/2=11cm area of inner circle=πr² =22/7×10×10 =2200/7cm² area of outer circle=πr² =22/7×11×11 =2662/7cm² hence, area of the ring=2662-2200/7 =462/7 =66cm²

Find the area of a circular ring whose inner and outer diameters are 20 cm and 22 cm, Tespectively

Answer»

diameter of inner circle=20cm

therefore radius=20/2=10cm

diameter of outer circle=22cm

therefore radius=22/2=11cm

area of inner circle=πr²

=22/7×10×10

=2200/7cm²

area of outer circle=πr²

=22/7×11×11

=2662/7cm²

hence, area of the ring=2662-2200/7

=462/7

=66cm²