Question

In a handkerchief of diameter 40 cm there is a border of 2 cm find area the border

Answer 1

Answer:

Step-by-step explanation:

diameter of the handkerchief  = 40 cm

its radius = diameter/2 = 40cm/2 = 20cm

width of the border = 2 cm

total area of the circle = $\pi r^{2}$

                                       = (3.14) (20)(20) square cm

                                       =1256 cm square

area of the inner circle = $\pi r^{2}$

                                     as inner radius of the circle is 2 less than the actual                      radius of the circle

                                      = (3.14)(18)(18)square cm

                                      =1017.36 square cm

area of its border = (area of the total circle - area of the inner circle )

                               = (1256 - 1017.36) square cm

                                 = 238.64 square cm (answer)