Question

6.

Find the area between two concentric circles having radius 7 cm and 2.1 cm, respectively.​

Answer 1

Answer:

140.14 sq cm

Step-by-step explanation:

Area of larger circle =pi * R^2

                                 =22*7*7/7

                                 =154 sq cm

Are of smaller circle=pi*r^2

                                 =22*2.1*2.1/7

                                 =13.86 sq cm

Area between Two concentric circle=area of larger circle -area of smaller circle

                                                             =(154-13.86)sq cm

                                                             =140.14 sq cm