Question

13. The areas of two concentric circles are 1386 cm and 1886.5 cm respectively. Find the width
the ring
14. In Fig. 14.22, find the area of the shaded region. [Use t = 3.14.]
B
-12 m
5 m​

Answer 1

Answer:

Solution:

Given: The areas of two concentric circles are 1386 sq.cm and 1886.5 sq.cm. respectively.

Width of the ring = larger radius - smaller radius (of the concentric circle)

                          w=R-r

                   

Area of larger circle=πR²

                    1886.5=22/7(R²)

        1886.5 x 7/22=R²

          85.75x7=R²

            600.25=R²

                     R=√600.25

                     R=24.5cm

Area of smaller circle=πr²

                           1386=22/7(r²)

               1386 x 7/22=r²

                        63 x 7=r²

                                r²=441

                                r=√441

                                r=21cm

Width of the ring(formed by concentric circles)=R-r

                                                                               =24.5-21

                                                                               =3cm

∴Width of the ring = 3cm

Step-by-step explanation:

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Answer 2

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