Question

the radius of two concentric circles are 9 cm and 12 CM respectively find the area of the circular path between the two circles​

Answer 1

Let R be 12 cm and r be 9 cm

area of the circular path =

pie(R^2 - r^2)

22÷7 (12^2 -9^2)

22÷7(144-81)

371.2714cm square

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Answer 2

Answer:

= $198 cm^{2}$

Step-by-step explanation:

R = 12 cm

r  = 9 cm

area of the circular path between the two circles

                                                        ​ = area of outer circle -area of inner circle

                                                           =  $\pi R^{2} - \pi r^{2}$

                                                          = $\pi (R^{2} -r^{2} )$

                                                           = $\frac{22}{7}$×$(12^{2} -9^{2} )$

                                                          =    $\frac{22}{7} (12+9)(12-9)$

                                                             = $\frac{22}{7}$×21×3

                                                             = 22×3×3

                                                             = $198 cm^{2}$

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