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A brooch is made with silver wire in the form of a circle with diameter 35 mm. The wire is also used in making 5 diameters which divide the circle into 10 equal sectors as shown in Fig. Find : (i) the total length of the silver wire required.

9. A brooch is made with silver wire in the form of a circle with diameter 35 mm. The wire is also used in making 5 diameters which divide the circle into 10 equal sectors as shown in Fig.  Find :

 (i) the total length of the silver wire required.

                        

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The total wire required will be for 5 diameters and the circumference of the brooch.

The circumference of the brooch:- 

                                                           \\=\ 2\pi r\\\\=\ 2\times \pi \times \frac{35}{2}\\\\=\ 110\ mm

Hence the total wire required will be:-      =\ 110\ mm\ +\ 5 \times 35\ mm\ =\ 285\ mm.

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